Grant Grinnell is a certified tennis instructor with the United States Professional Tennis Association.  (USPTA) He is currently working at Eastside Tennis Center in Kirkland, Washington. 


“Transformational tennis coach. Brilliant... Can improve your tennis and change your experience with the game. I Highly recommend Grant.” Lori Wartman

"Due to his special talent as an instructor, I have been able to perform at a level I never dreamed possible." Mary Houghes

"We got more out of our first hour with Grant than we had working six months with another instructor" Rick Baxter

"The most up to date ball-striking instruction I have ever experienced. Hands down the most valuable tennis instruction on the planet." Byron Elton

"I feel very fortunate to have had your remarkable expertise, amazing instruction and knowledge. Grant is the tennis whisperer." David Montalba

"Grant is the only one that has made a dramatic, significant difference in his game and his confidence." Peggy Loshin

"The number of aha moments we experienced in those five days was unbelievable. Every facet of our game improved and we had a great time to boot." Brian Williams

"He uses a creative flexible approach to finding solutions that work for each individual." Pam Potter

"As a former NCAA Division 1 tennis player with numerous coaches throughout my junior, collegiate, and pro career; Grant was able to identify shortcomings in my game quicker than anyone I have worked with in the past. Gabe Davis

"Grant is an amazing, gifted instructor." Vikki Littleman

"He has the ability to take a group of players and not miss one small detail."
Debbie Loop

It’s a gift and a talent that Grant has in abundance. His ability to recognize
and communicate ways to improve our game is truly amazing."
 Hitomi Saheki

"Grant has made us all believe in ourselves and each other and we had a great season." Pam Pugel

"He helped me add more shots to my game than all my other instructors combined." Lois Mustoned

"Grant is the most talented teacher We've had the pleasure to work with, and we've worked with some very good tennis pros." Rick Morrisse

"His knowledge and commitment is better than any other five star resort I have been to. He is phenomenal." Anton Rabie

"I've taken tennis instruction from resorts all over the world. It is extremely rare to find a teacher with the skill and person of Grant. He was the highlight of my amazing experience." Andrew Ruff

"Ten minutes with Grant is like working four weeks with another pro."
Sam Rearden

"Grant has a very unique ability unparalleled by any of the coaches we have hired." 
Ed Seeton

"He is the most outstanding instructor I've ever had the privilege to work with." 
Dena Kenedy

"In a short time he was able to solve problems in my game that frustrated me for years. In my past coaching career I observed many successful college and olympic coaches; Grant is by far one of the best instructors and communicators I have experienced." Doris Glaz

"I have played tennis, coached tennis, and generally enjoyed the game for over 35 years. From my point of view, Grant is one of the best instructors of the game I have encountered. He is a rare combination of effective teacher and encourager." 
Steve Charleston

"He is dependable, always on time and always has a smile on his face. He is truly the best instructor I have ever had. His passion for the game and people is evident in everything he does." Kim Vaughn.

"Grant is the finest coach I have encountered in the world. Four Seasons is fortunate to have him." Sarah Hunter

"His teaching style is powerful, direct and produces results." Michelle Seidl

Grant Grinnell has spent his entire professional life dedicated to developing the most effective and efficient methods to helping athletes find their best fast.  I have personally benefited as a current 6.0 tennis player, and as a full time coach more from Grant's methods than all of my other resources put together.  I estimate that Grant's teachings have fast forwarded my knowledge base and instructional abilities ten years, and frankly I may have never reached the level I feel I am currently without Grant's help. Jesse Schouten

"You're amazing! In ten years of taking tennis lessons, I haven't found anyone that can come close to your teaching style. Thanks for making my Maui trip so special.. All those glowing testimonials on your website were absolutely right on... Grant is the Greatest." Eliana Brooke


Grant has just published a new Tennis Strategy Book available at

This amazing quick-fix book gives you tactics necessary to beat any style player, singles or doubles. The book is divided into three sections. The first section will teach you different styles of play, how to analyze your opponent and how to handle important match play moments. The second section focuses on how to adapt your game and problem solve to beat any style opponent. The third section is a quick-fix mental toughness section to free your mind and emotions from blocking the natural flow of your body.

Grant has carefully crafted this book considering your precious time, your ability to understand the content and fearlessly apply it to your game.