Rising Russian star Daniil Medvedev says he uses the full shot clock on clay but that's not the case on grass.
A 25-second shot clock was introduced at tournaments to speed up matches.
Medvedev, 23, is having a great week at the Queen's Club.
The Russian demolished Argentina's Diego Schwartzman 6-2 6-2 to reach his maiden semifinal in Queen's.
No. 4 seed Medvedev broke the world No. 23 in the opening and fifth game to easily win the opener.
Exactly the same scenario happened in the second set as the Russian broke Schwartzman in the first and fifth game to seal a straight-set win.
Medvedev hit seven aces, won 75 percent of his first serve points and saved 4-of-4 of Schwartzman's break point opportunities in an hour and 16 minutes of play.
"On clay I'm serving one second before the shot clock because the rallies are long, but on grass you are not that tired, so I don't need the 25 seconds. So it depends how tired you are," Medvedev said after beating Schwartzman, per Matthew Willis.
from Tennis World USA http://bit.ly/2WTOCY5
Tennis
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