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.

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.

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

SAMANTHA “Sam” MARTINELLI
Tennis Professional

  • Former D-1  #1 singles and doubles at Yale University

  • First All-American player at Yale Women’s Tennis history

  • Achieved a career-high ITA doubles ranking of #2, #30 in singles.

  • BA degree in History and MS in Management from Wake Forest University 

  • 4 years coaching experience 

  • Taught at Creek Club, NY, Colorado Athletic Club, Telluride Racquet Club.

DOR AMIR
Tennis Professional

  • Tel Aviv native

  • Ranked #1 in Israel at 17 years old

  • #150 in the World Junior rankings

  • #1 singles at Northern Illinois University 

  • Triple Crown winner in 2018 (Colorado State Open - singles, doubles, mixed doubles - ALL at the Open Level)

AMINA ISMAIL
Tennis Professional

  • Achieved a top 10 doubles ranking at the University of Missouri, the highest in program history

  • Collectively earned a team ranking of #27 at Missouri (school record)

  • Career-high ITA singles ranking of #73 in the country

  • Big East Team Champion as a sophomore at Xavier University

  • 10 years coaching experience

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

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

— DAMON GILLETTE, General Manager