Italian Daniele Bracciali and his occasional doubles partner Potito Starace are being investigated for corruption after intercepted internet conversations claiming they sold matches were reported in the Italian media several weeks ago.

While Daniele Bracciali and Potito Starace have refused to comment on accusations against them, Italian media has access to a suspicious internet conversation which points at match-fixing.

Djokovic dropped his serve to fall behind 2-1 in the opening set but broke back immediately and took control from there against his 32-year-old opponent.

Top-ranked Novak Djokovic advanced to the second round of the French Open by beating Potito Starace of Italy 7-6 (3), 6-3, 6-1 on Monday.

French Open dangerman Juan Martin Del Potro shrugged off a knee injury scare as well as sweltering 30-degree heat to reach the French Open second round on Sunday.

Veteran Czech Radek Stepanek on Tuesday ended the Madrid Masters run of Australian Bernard Tomic in the first round, with the Queensland youngster exiting 6-2, 7-5.

Australians Bernard Tomic and Marinko Matosevic took similar paths to the quarterfinals of the BMW Open on Thursday.

Juan Martin del Potro celebrated the start of his pre-French Open campaign with a 6-1, 6-0 hammering of Portugal's Rui Machado to reach the quarter-finals of the Estoril Open on Thursday.

Australia's Bernard Tomic bowed out of the Barcelona Open in the second round on Wednesday after losing a marathon battle to Spanish clay specialist Albert Montanes 6-0, 5-7, 7-5.

Seventh-seeded Albert Montanes of Spain lost to Filippo Volandri of Italy in the first round of the Brazil Open on Monday.