London: Agnieszka Radwanska booked her spot in the Wimbledon quarter-finals with a 7-5, 6-4 win over former world number one Jelena Jankovic on Monday.


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The Polish 13th seed defeated the Serbian 28th seed -- who knocked out defending champion Petra Kvitova in the third round -- in an hour and 43 minutes.


Radwanska, the 2012 Wimbledon runner-up, faces Madison Keys of the United States, the 21st seed, in Tuesday`s quarter-finals.


Jankovic lost her cool with the umpire towards the end of the match, telling him: "We`re humans here.


"Well done. I don`t want to speak to you."