The match fixing allegations surrounding Nikolay Davydenko have surfaced again at the U.S. Tennis Open after the Russian fifth seed lost fourth-round loss to130th-ranked qualifier Gilles Muller of Luxembourg.
Muller is the first qualifier since 2000 to make a grand slam quarter final.
Davydenko is involved in a still-unfinished match-fixing probe rising from odd betting patterns involving $10 million, after a surprise loss a year ago in Poland.
Muller will now play former world number one Roger Federer who scraped past 23rd seed Igor Andreev 6-7 7-6 6-3 3-6 6-3.
The four time U.S. open champion has reached the quarter finals of every grand slam since Wimbledon in 2004 and depsite making an uncharacteristic 60 unforced errors still declared himself pleased with the way he played
American favourite Andy Roddick also went through to the quarter-finals and will meet Novak Djokovic in the quarter-finals after the Serbian third seed won a gruelling five-setter against Tommy Robredo of Spain.
While in the women's draw Olympic champion Elena Dementieva and second seed Jelena Jankovic advanced to the semi finals.