Jan-Lennard Struff vs Alexander Bublik — R16 — Stuttgart Open

Five hours and forty-three minutes of serve-bombing went Bublik's way at the Boss Open, and the difference was what happened behind the first ball: Alexander Bublik won 46 of 49 first serves (94%) to Jan-Lennard Struff's 79%. After taking the opener in a tiebreak and surrendering the second 6-3, Bublik's serve held up late, 22 aces to Struff's 16, and he closed the third 6-2. Both men won exactly 14 games and 172 total points was split 91-81 — a margin built almost entirely on those untouchable first deliveries. It's Bublik's fourth win in six meetings, and a first on grass.