South African Kevin Anderson secured a place in the second round of the Queen's club grasscourt event with a 4-6, 6-3, 6-4 win over Britain's James Ward on Tuesday.
2007 finalist Nicolas Mahut of France started with a win over Spain's Guillermo Garcia-Lopez 6-4, 6-2, while Jamie Baker defeated fellow Briton Oliver Golding 7-6(1), 6-3.
Australian Matthew Ebden dispatched Germany's Matthias Bachinger 7-6 (5), 6-3.
The results:
At London (ATP AEGON Championships): First round: Grigor Dimitrov bt Bobby Reynolds 6-3, 7-5; Lu Yen-Hsun bt Igor Kunitsyn 4-6, 7-6(4), 6-3; Ryan Sweeting bt Dmitry Tursunov 6-4, 7-6(6); Simone Bolelli bt Ernests Gulbis 6-3, 6-4.
Kevin Anderson bt James Ward 4-6, 6-3, 6-4; Nicolas Mahut bt Guillermo Garcia-Lopez 6-4, 6-2; Jamie Baker bt Oliver Golding 7-6(1), 6-3; Matthew Ebden bt Matthias Bachinger 7-6(5), 6-3; Gilles Muller bt Liam Broady 6-1, 6-2; Steve Darcis bt Ruben Ramirez-Hidalgo 7-6(2), 7-5; Eduard Roger-Vasselin bt Evgeny Korolev 6-7(5), 6-2, 6-4; Ivo Karlovic bt Lleyton Hewitt 6-3, 6-2.
At Halle (ATP Gerry Weber Open): First round: Lukas Lacko bt Konstantin Kravchuk 2-6, 6-2, 6-3; Marcel Granollers bt Mischa Zverev 6-4, 6-2; Florian Mayer bt Tim Smyczek 6-4, 6-4; Viktor Troicki bt Benjamin Becker 6-2, 7-6(6); Radek Stepanek bt Andreas Seppi 7-6(6), 4-6, 7-6(7); Tommy Haas bt Bernard Tomic 5-2 retd; Phillip Kohlschreiber bt Dustin Brown 7-6(4), 7-6(4); Mikhail Youzhny bt Robin Haase 6-3, 6-2; Milos Raonic bt Philipp Petzschner 7-5, 7-6(1); Lukasz Kubot bt Jarkko Neiminen 6-4, 6-4.
At Birmingham (WTA AEGON Classic): First round: Jie Zheng bt Alla Kudryavtseva 6-4, 4-6, 6-3; Melanie South bt Mirjana Lucic 6-1, 4-6, 6-3; Misaki Doi bt Noppawan Lertcheewakarn 6-4, 3-6, 6-3; Laura Robson bt Grace Min 6-4, 6-1; Sesil Karatantcheva bt Tamarine Tanasugarn 6-4, 6-2.
Tara Moore bt Iveta Benesova 6-1, 6-2; Casey Dellacqua bt Garbine Muguruza 6-2, 3-6, 6-2; Melanie Oudin bt Sorana Cirstea 3-6, 6-3, 6-2; Andrea Hlavackova bt Michaella Krajicek 6-2, 6-7(6), 4-0 retd; Anne Keothavong bt Tamira Paszek 6-2, 7-5; Elena Vesnina bt Olivia Rogowska 6-3, 6-2; Michelle Larcher de Brito bt Bojana Jovanovski 3-6, 7-5, 6-4; Urszula Radwanska bt Samantha Murray 6-4, 6-4.
