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Venus Williams had reason to smile Monday at the Australian Open. When she beat Agnieszka Radwanska, she achieved a first grand slam quarterfinal in five years. Quinn Rooney/Getty Images
It was also Williams' first win over a top-10 player at a major in five years. Quinn Rooney/Getty Images
The last time Venus and younger sister Serena both appeared in a grand slam quarterfinal was at Wimbledon in 2010. Serena progressed to the last eight at Melbourne earlier Monday. Elsa/Getty Images
If they both win their quarterfinals, the siblings would meet in a grand slam for the first time since Wimbledon 2009. GLYN KIRK/AFP/Getty Images
That year, Serena beat Venus 7-6 (7/3) 6-2 in the final at the All England Club. CARL DE SOUZA/AFP/Getty Images)
The Australian Open was where the sisters first faced off in 1998. Venus won on that occasion but Serena leads the series 14-11 overall. GREG WOOD/AFP/Getty Images
