Westfield Matildas star Sam Kerr meets tennis legend Serena Williams

Two sporting superstars came together in Melbourne on Thursday as Westfield Matildas ace Sam Kerr met tennis great Serena Williams.

Williams, a 31-time Grand Slam singles champion, is in the country for the upcoming Australian Open.

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Kerr was able to meet with the American sporting legend at a promotional event for Nike.

The Perth Glory and Westfield Matildas spearhead sent social media into a frenzy by sharing a picture of the encounter on Instagram.

"When you meet the actual GOAT [Greatest Of All Time]," Kerr wrote.

Glory captain Kerr will be back in Westfield W-League action when she leads Perth at Newcastle Jets on Saturday.

The 25-year-old is due to return to Melbourne in March, when the Westfield Matildas take on Argentina at AAMI Park in the Cup of Nations.