Father, Tom, is a tennis teaching pro; mother, Anita; brothers, Trevor and Todd.
Dad played at 1982 USTA Boys' 18s National Championships -- tournament won by Zachary in 2019 and 2021.
Began playing tennis at age 2.
Trains occasionally with countrymen Taylor Fritz and John Isner.
Practised with Roger Federer prior to each of Swiss' matches en route to 2019 ATP Masters 1000 Indian Wells final.
Lists Isner and Federer as his tennis idols.
Favourite shot is backhand, surface is hard and tournament is US Open.
Says New York City is his favourite city on tour.
Favourite superhero is Captain America, movie is Harry Potter, TV show is The Office and actor is Steve Carell.
Favourite book is The Obstacle is the Way by Ryan Holiday.
Enjoys golf, basketball and going to the beach. Supports Golden State Warriors (NBA).
Favourite musician is Khalid.
Secret talent is ping pong.
Favourite food is barbecue, but guilty pleasure is dessert.
Says that his best quality is calmness and his worst quality is organizational skills.
Turnedpro in August 2019 after being namedTennisRecruiting.net's No. 1-ranked American recruit for Class of 2021.
(UPDATED 26 AUGUST 2023)
Qualified into 2023 US Open main draw for 1st time and making 3rd overall appearance at Flushing Meadows after WCs in 2019 (l. to Lorenzi in 5 sets) and 2021 (l. to No. 16 Sinner in 4 sets in 2R)..
Secured 1st ATP Ranking point at age 15 in 2018 and achieved career-high No. 201 on 19 June2023 after 2R results in Surbiton (d. No. 97 Vukic) andNottingham (d. No. 88 Kokkinakis) Challengers.
Won 1st ATP Challenger Tour title at 2022 Tiburon, CA (d. Shelton) and during summer won back-to-back ITF World Tour titles in Southern California. Has 31-25 career ITF record with 3 titles and 25-27on Challenger level.
Defeated Cecchinato for 1st tour-level win at 2021 US Open as 18-year-old WC while ranked No. 716 (l. to Sinner in 2R).
Squandered 2-set lead vs. Lorenzi in tour-level debut at 2019 US Open as 16-year-old WC, becoming youngest player to compete at event since Young, 16, in 2005.
Earned US Open WCs by winning 2019 and 2021 USTA Boys' 18s National Championships.
Lost to 2018 USTA Boys’ 18s champion Brooksby in 2021 Cleveland Challenger 1R and 2017 USTA Boys’ 18s champion Kypson in 2021 Wichita ITF QF.
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