Stan Wawrinka marked another memorable moment in his farewell season on Wednesday at the ABN AMRO Open in Rotterdam, where he defeated 17-year-old Dutch lucky loser Thijs Boogaard in the first round.
The 40-year-old Swiss star, who captured the ATP 500 title in 2015, downed Boogaard 6-4, 6-3 in a clash spanning more than two decades in age difference. The 23 years and three months separating Wawrinka and Boogaard now ranks as the second-largest age gap in ATP Tour and Grand Slam history, trailing only Dominic Thiem’s 2011 win over Thomas Muster by two years and eight months.
Biggest age gaps on the ATP Tour (since 1990)
| Age Gap | Match | Tournament |
| 25y 11m | Dominic Thiem (18) d. Thomas Muster (44) | 2011 Vienna |
| 23y 3m | Stan Wawrinka (40) d. Thijs Boogaard (17) | 2026 Rotterdam |
| 21y 8m | Dick Norman (38) d. Daniel Berta (16) | 2009 's-Hertogenbosch |
| 21y 7m | Carlos Alcaraz (17) d. Feliciano Lopez (39) | 2021 Marbella |
| 21y 5m | Ivo Karlovic (29) d. Felix Auger-Aliassime (18) | 2019 Pune |
Next up, Wawrinka will face top seed and two-time defending finalist Alex de Minaur, promising another high-stakes encounter as the former No. 3 player in the PIF ATP Rankings continues his swan song on Tour.
“He’s a tough player,” Wawrinka said of de Minaur, who leads their Lexus ATP Head2Head series 1-0. “Especially in these conditions, it’s going to be difficult to generate something. But I’m looking forward to the challenge. I’ve been playing some good matches against top players, so I’m always trying to push myself.”
Wawrinka made headlines at the Australian Open last month by becoming the oldest man to reach the third round of the hard-court major since Ken Rosewall.