Meet our team.

DAMON GILLETTE
General Manager

  • Denver Native

  • Started playing tennis at age 6

  • Played on the ATP World Tour & USTA Pro Circuit

  • Coached at Advantage Tennis Academy in Irvine, California

  • Active player in the Men's Open level in Colorado

  • Founder of Hi-Def Tennis 

  • Member of the USPTA

  • Philosophy: "Serve +1 and Return +1 keep it simple”

  • Enjoys working with members to prepare them for their best tennis.

email damon

CATRINA THOMPSON
Assistant Manager/Head Pro

  • Achieved #1 USTA junior doubles ranking winning national junior titles on hard courts, clay courts, and grass courts.

  • Won 6 gold, 3 silver, and 2 bronze balls in USTA national junior tournaments.

  • Graduated from University of Notre Dame in 2007 with a BA degree.

  • Played #1 singles and #1 doubles at University of Notre Dame, was a three-time NCAA Doubles All-American and achieved career-high ITA/NCAA #1 doubles ranking (with twin sister and DTC member Christian Bass).

  • Women’s head tennis coach at University of Minnesota 2017-2023

  • Enjoys working with players to help assist in reaching their goals and enjoying the game of tennis.

email catrina

TOMMY KOSZOWSKI
Junior Director

  • Colorado Native

  • 7 years coaching experience

  • #1 singles and doubles at Regis Jesuit and Whittier College

  • 1st Team SCIAC and academic honors

  • Co-founder & trainer of Hi-Def Tennis

email tommy

TERRY WARD
Tennis Professional

  • Lifelong passion for tennis with over a decade of professional teaching experience, began playing at age four

  • Consistently ranked in the Top 10 junior players in the St. Louis area

  • Began teaching at 16, leading junior clinics and summer camps

  • Played four years of varsity singles at Marquette High School

  • Has spent the past nine years coaching players of all ages and levels

email TERRY
email Sean

IGGY CASTELINO
Tennis Professional

  • Colorado Native

  • 2023 USTA Colorado Male Player of the Year

  • 2x Team Captain for the University of Denver Men’s Tennis Team (2018-2020)

  • High School State Champion at 5A #1 Singles for Fairview High School (Boulder, CO)

  • 7 years coaching experience

email IGGY

SEAN AMBERG
Tennis Professional

  • Began playing tennis at age 3 and developed as a nationally ranked junior at Southern California’s Jack Kramer Club.

  • Ranked among the Top 10 juniors in Southern California and Top 50 nationally.

  • Brings more than 15 years of coaching experience at leading clubs in California, Nevada, and Las Vegas.

  • Led tennis programs and school teams from preschool through high school, including multiple Nevada 4A State Championships.

  • Named 2025 Coach of the Year and remains an active USTA Adult League competitor who is passionate about helping players of all levels improve and enjoy the game.

“Serve +1 and Return +1…keep it simple out there.”

— DAMON GILLETTE, General Manager