Former world number one Marat Safin ended his playing career with a 6-4, 5-7, 6-4 defeat by US Open champion Juan Martin del Porto at the Paris Masters on Wednesday.
Leander Paes and Mahesh Bhupathi made a successful return to the tour, advancing to the second round of the Ordina Open with a straight sets win over Yves Allegro and Sebastian Prieto on Tuesday. The former world No 1 pair, seeded second at Hertogenbosch, won 6-3, 7-6 (3).
The winner of the quarter-final between Bhupathi-Mario Ancic and Paes-Aisam Qureshi, who were slated to meet Gremelmayr and compatriot Simon Greul, will receive a walkover into the final.
Rafael Nadal and Andy Roddick advanced into the last eight of the Miami Masters.
David Ferrer won his third consecutive Buenos Aires ATP claycourt title, and the sixth in a row by a Spaniard, when he beat Italian Fabio Fognini 6-4, 6-3 in the final on Sunday.