Philipp Kohlschreiber was pinned so far behind the baseline, he could have used the radar display as a step stool to return Lukas Rosol's serve, which sprung to shoulder heights.
When Rosol wasn't twisting the ball out of Kohlschreiber's strike zone, be was busy blasting drives down the line. Broken for the only time when he served for the match at 5-4, Rosol rebounded for a 7-5, 7-6 (5) victory to bounce the fifth-seeded German out of Stuttgart in one of the best matches of the day.
Kohlschreiber has a history of peaking at home. Four of his five career titles—Düsseldorf (2014), Munich (2012 and 2007) and Halle (2011)—have come on home soil. Seven of Kohlschreiber's 11 final appearances have come in Germany. He beat Jan-Lennard Struff in a rain-delayed all-German first-rounder this morning and played solidly in round two, but Rosol refused to let the world No. 26 get too comfortable on court.
A stinging cross-court backhand return gave Rosol the first break and a 6-5 lead. The 6'5" Czech won 15 of 16 points played on his first serve in the opener, and his ability to strike quickly denied his opponent rhythm. Rosol ripped another backhand return winner down the line for break point in the opening game of the second set. Following a mishit forehand return to net, he caught a break when Kohlschreiber netted a mid-court forehand, donating the break and a 2-0 lead.
Grass was a launching pad for Rosol, who gained international attention for his 2012 Wimbledon upset of Rafael Nadal. But clay is his best surface because it gives him the time to unleash his sweeping swings. Rosol reached the Bucharest final on clay in April, falling to Grigor Dimitrov. He beat compatriot Jiri Vesely to win the Prague Challenger on clay last month, and he struck with ambition at crunch time today. Deadlocked at 5-all in the tiebreaker, Rosol lashed an ace down the middle and followed with a forehand return winner down the line. He will play fourth-seeded Feliciano Lopez in Friday's quarterfinals.