HALLE (AFP) - Taiwans Yen-Hsun Lu booked his place in the second round of Halles ATP tournament with a 7-6 (7/2), 6-3 win over Finlands Jarkko Nieminen on Monday. Lu, who reached the quarter-finals at Wimbledon last year, finally got into his stride in the second set but admitted the transition from clay to grass is no easy task. It was a tough match to start the grass-court season, I know Jarkko is very good on grass, said Lu, who upset Andy Roddick to reach the last eight at Wimbledon last year. We were both trying to find a rhythm and get a feel for the grass. It was a high quality match and I am glad I won; there are lots of positives to take. Its not easy to switch from clay to grass; there is a lot of difference. You are using different muscles; the ball is a lot lower. I have had two days practice, I still have two more weeks (until Wimbledon), so there is plenty of time to get ready. Lu will play a German in the second round and faces either wild-card Dustin Brown or sixth-seed Florian Mayer. For sure, they will want to do well at home and they will have the crowd behind them, said Lu. Top-seed Federer, who lost out to Spains Rafael Nadal in Sundays final at Roland Garros, has the chance to avenge his defeat to Hewitt in last years final.