BEIJING, China - Last Friday at the China Open, Flavia Pennetta defeated Caroline Wozniacki in the singles quarterfinals then, alongside Gisela Dulko, beat Liezel Huber and Lisa Raymond in the doubles semifinals. So Pennetta beat both No.1s - Wozniacki in singles, Huber in doubles - on the same day.

Exactly how rare was the feat? Try second time ever...

Players to beat both singles No.1 & doubles No.1 on same day:

Steffi Graf
Monday, May 19, 1986 in Berlin, Germany...
d. Navratilova in singles final, 62 63
w/Sukova, d. Navratilova/Temesvari in doubles final, 75 62
(Navratilova No.1 in both singles and doubles)

Flavia Pennetta
Friday, October 7, 2011 in Beijing, China...
d. Wozniacki in singles QFs, 36 60 76(2)
w/Dulko, d. Huber/Raymond in doubles SFs, 64 62
(Wozniacki No.1 in singles, Huber No.1 in doubles)

Additionally, Pennetta is one of only five players ever to beat both singles No.1 and doubles No.1 at the same tournament at all:

Steffi Graf
1986 Berlin
d. Navratilova in singles final, 62 63
w/Sukova, d. Navratilova/Temesvari in doubles final, 75 62
(Navratilova No.1 in both singles and doubles)

Jana Novotna
1996 Atlanta Olympics
d. Seles in singles QFs, 75 36 86
w/Sukova, d. Martínez/Sánchez-Vicario in doubles SFs, 62 76(1)
(Seles No.1 in singles, Sánchez-Vicario No.1 in doubles)

Lindsay Davenport
2000 Indian Wells
d. Hingis in singles final, 46 64 60
w/Morariu, d. Hingis/Pierce in doubles SFs, 36 76(5) 61
(Hingis No.1 in both singles and doubles)

Venus Williams
2009 Wimbledon
d. Safina in singles SFs, 61 60
w/S.Williams, d. Black/Huber in doubles SFs, 61 62
(Safina No.1 in singles, Black & Huber co-No.1s in doubles)

Flavia Pennetta
2011 Beijing
d. Wozniacki in singles QFs, 36 60 76(2)
w/Dulko, d. Huber/Raymond in doubles SFs, 64 62
(Wozniacki No.1 in singles, Huber No.1 in doubles)