The beefed-up Australian, better known for his baseline tenacity, smacked 15 aces past the Czech as he advanced.
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Hewitt is seeded to meet champion and top seed Roger Federer in the semi-finals.
Results from the Wimbledon Men's Singles matches on Wednesday:
Round 2:
3-Lleyton Hewitt (Australia) beat Jan Hernych (Czech Republic) 6-2 7-5 3-6 6-3
25-Nicolas Kiefer (Germany) beat Alessio Di Mauro (Italy) 6-3 7-5 6-3
21-Fernando Gonzalez (Chile) beat Tomas Zib (Czech Republic) 6-4 7-6(6) 6-3
Jonas Bjorkman (Sweden) beat 8-Nikolay Davydenko (Russia) 6-7(4) 1-2 RET
1-Roger Federer (Switzerland) beat Ivo Minar (Czech Republic) 6-4 6-4 6-1
Justin Gimelstob (United States) beat 29-Nicolas Massu (Chile) 6-3 4-6 7-6(5) 7-6(0)
23-Juan Carlos Ferrero (Spain) beat Hyung-Taik Lee (South Korea) 6-4 3-6 4-6 6-3 6-3
5-Marat Safin (Russia) beat Mark Philippoussis (Australia) 7-6(4) 7-6(4) 6-4
24-Taylor Dent (United States) beat Kevin Kim (United States) 6-3 6-4 6-4
26-Feliciano Lopez (Spain) beat David Sherwood (Britain) 6-2 6-4 6-2
Tomas Berdych (Czech Republic) beat Lars Burgsmueller (Germany) 6-3 6-3 6-1
Round 1
9-Sebastien Grosjean (France) beat Michael Llodra (France) 3-6 7-5 4-6 7-6(5) 6-4
