The Importance of Proper Grip ft. Mark Merklein and Matt Daly

Summary

Mark Merklein and Matt Daly, co-founders of Grip MD — a physical teaching aid that locks a player’s hand into the continental grip position — discuss the central importance of grip technique in tennis development and how their product attempts to solve the coaching problem of grip compliance. Daly is the originator of the grip-first philosophy and the initial product concept; Merklein brought the engineering, manufacturing, and coaching network to execute it. Together they trace the product from kitchen prototypes drilled directly onto rackets through a prosthetics company’s involvement in material selection to its current commercial form: a two-piece silicone mold that clicks onto any grip size (zero through four and a half) and allows players to feel the correct continental grip position immediately. Endorsers include James Blake and John Isner. The episode is primarily a product demonstration (a video version was recommended) but contains substantive coaching content on why grip determines technique, not the reverse.

Guest Background

Matt Daly has worked with tennis players from beginners through top-100 ATP professionals, including a case where a top-50 professional changed his serve grip during a six-week off-season — demonstrating that grip change at the professional level is possible under time pressure when executed correctly. His background is primarily in private coaching and he has long held the view that grip should be the starting point of technical instruction, not an afterthought corrected once other problems emerge. He connected with Daly’s coach Brian Barker, who was USTA National Coach of the Year and coached James Blake from age 12 to world number four, as a formative influence on the product concept.

Mark Merklein is a long-time tennis professional who traveled on tour with James Blake and Brian Barker. He converted Daly’s concept into a manufactured product: running engineering trials, working with a prosthetics company to develop the mold material, managing grip size variants (zero through four and a half), and taking the product to USTA national coaches for feedback and validation. The feedback was described as “tremendous.”

Key Findings

1. Coaches Teach Around Wrong Grips — Fixing the Grip Fixes the Technique

Daly’s foundational argument: most technical corrections in tennis are downstream symptoms of incorrect grip position. On the serve, a grip that is even fractionally off produces a dropped elbow, a toss that drifts left, and a contact point that is too low. Coaches then spend lessons telling the player to get the elbow up, move the toss, get the contact point higher — all corrections that treat symptoms while the cause (wrong grip) remains. The same principle applies across volleys, slices, and approach shots. If you place a player in the correct continental grip first, the biomechanically efficient swing path emerges naturally, and the downstream compensations disappear without being directly addressed.

2. The Continental Grip Is the Foundation That Enables Every Other Shot

The reason Grip MD launched with the continental grip rather than forehand or backhand grips: the continental is the one grip that must be mastered before all others. It is the correct grip for serves, volleys, slices, overheads, and backhand drives (with modifications). Professional players switch between grip variants for different shots — but all of those grip variants are modifications from or rotations relative to the continental. Daly and Merklein plan to release forehand and backhand grip variants in subsequent product generations, but the continental is the foundation that, once established, makes all other grip work faster and more reliable.

3. Kids Cheat the Grip Because They Want to Make the Shot

The most common failure mode Merklein observed coaching before Grip MD: a player placed in the correct continental grip before serving or volleying would drift back to their habitual (incorrect) grip in the milliseconds before contact. The hand wanted to “make” the shot. The result was coaches who could not verify grip compliance from across the court — they had to hop the net to check the hand position constantly. Grip MD eliminates this problem by making the incorrect grip position physically impossible: the ridges and palm placement don’t allow the hand to cheat. The player is forced to adjust their technique to fit the grip, rather than adjusting the grip to fit their habitual technique.

4. Initial Misses Are Part of the Process — Growth Mindset Required

Both Daly and Merklein warn parents explicitly: when a player first uses Grip MD, they will miss shots they normally make. The correct grip feels foreign, and the player’s technique needs time to recalibrate around it. A parent who cannot tolerate this initial regression will undermine the tool’s effectiveness. Lisa Stone frames this directly as requiring a growth mindset — the willingness to accept short-term deterioration in exchange for structural improvement. The specific sequence Daly describes: put on Grip MD, practice volleys and serves for five minutes with the new grip position (accepting misses), take it off, observe how the correct grip feeling has been transferred.

5. Wrong Grip Causes Injury Through Biomechanical Compensation Chains

Incorrect grip position does not only produce bad shots — it produces injury. When the serve grip is wrong, the elbow mechanism compensates, the toss position compensates, and the contact point compensates; with enough repetition, compensatory movements cause chronic stress injuries. Daly cites a pro tour player he observed with chronic bicep tendonitis from a too-Western forehand grip. Lisa Stone identifies backhand wrist injuries (increasingly common in juniors) as frequently traceable to incorrect grip. The biomechanical principle: when one link in the kinetic chain is wrong, every other link compensates, and the weakest compensating link eventually breaks down.

6. A Top-50 Professional Changed Serve Grip in Six Weeks

Daly includes this case specifically to counter the belief that grip change is too difficult or too slow for experienced players. A top-50 professional, under the time pressure of a six-week off-season, successfully changed their serve grip. The implication: adults who believe they are “stuck” with their habitual grip have more room to change than they assume, provided they use the right tools and accept the transition period. The time investment is significantly shorter with a physical constraint tool than with verbal coaching alone.

7. James Blake Was Coached to Number Four in the World Starting from Age 12

The product’s most prominent endorsement context: Brian Barker — who Daly credits as a formative influence on his grip philosophy — was USTA National Coach of the Year and coached James Blake from age 12 to world number four. Mark Merklein traveled on tour with Blake and Barker. The Grip MD product was taken to USTA national coaches for validation and received “tremendous feedback.” John Isner is also cited as an endorser. The coach-to-product lineage connects the tool directly to coaches who worked with players at the highest level of the game.

8. Material Selection Required Tennis-Player-Specific Criteria

Merklein describes the material selection process: soft enough to be comfortable during repetitive contact, durable enough to withstand sustained use, and grippy enough to maintain hand contact under sweat conditions. Tennis players are described as “particular, just like golfers.” Initial kitchen prototypes were drilled directly onto rackets; the prosthetics company provided the material science expertise. The final product comes in two pieces that click together around the grip, can be removed and reattached, and works on any standard racket with a grip size between zero and four and a half. A smaller version for junior grip sizes (size zero and one eighth) was in production at the time of recording.

Actionable Advice for Families

• If your child’s coach is frequently correcting elbow position, toss location, or contact point on the serve, ask whether the coach has checked grip position first — all three of those errors are commonly downstream of a fractionally incorrect continental grip
• When a grip correction is attempted, commit to the discomfort period: misses in the first five to ten sessions with a corrected grip are normal and do not indicate the correction is wrong; abandoning a correct grip change because of short-term results is the single most common error in grip correction
• Ask your child’s coach about Grip MD, particularly for serve and volley development — the physical constraint accelerates the learning timeline and removes the constant teacher-monitoring requirement for grip compliance

INTENNSE Relevance

• Coaching education and product partnerships: Grip MD and products like it represent the kind of evidence-based coaching tool INTENNSE coaches could incorporate into pre-season and in-season training; a league-wide relationship with specific coaching aid brands would both improve player development and create commercial partnership opportunities
• Broadcast commentary on technique: Daly’s framework — that almost all serve and volley technical errors are downstream of grip — gives INTENNSE mic’d coaches a specific, teachable narrative for broadcast; a coach who can explain in-match why a player’s serve is breaking down (grip-driven biomechanics) is providing genuinely informative commentary, not filler
• Injury prevention and roster management: The injury chain Daly describes (wrong grip → compensatory movement → chronic injury) is directly relevant to INTENNSE’s unlimited substitution system and roster management; a league whose coaches understand and monitor grip compliance will have lower rates of the chronic upper-extremity injuries that curtail seasons
• James Blake connection: Blake’s endorsement of Grip MD and his appearance on ParentingAces (two weeks prior to this episode) create a natural connectivity opportunity for INTENNSE; Blake’s visibility in the tennis education and coaching world, his trajectory from public school to Harvard to number four in the world, and his current engagement with the sport make him a natural INTENNSE ambassador or broadcast voice
• Teaching standards across franchises: If INTENNSE creates a youth development curriculum tied to its teams, a standardized grip-first teaching sequence (with physical tools like Grip MD) would ensure technical consistency across all 10 markets — producing a recognizable, defensible player development philosophy that differentiates INTENNSE from ad-hoc local instruction

Notable Quotes

“A lot of times they’re teaching around the grip. If you get someone in the right grip, those things will fall in line — elbow up, toss position, contact point. They fix themselves.”

“When I see that great grip, you’ll start to see all the things that need to happen on a serve happen naturally.”

“It’s always not pretty in the beginning. But if you’re in the right grip, you can start to figure it out. The guesswork is gone.”

“A top-50 player in the world changed his serve grip in a six-week off season. So it can be done.”

“With overuse and the wrong grip, that can lead to problems. If you’re in the right grip, biomechanically everything works more efficiently.”

“Tennis players are particular, just like golfers. We knew we had to get that right.”