Serena Williams is often given to portraying superheroes. In her own words, she donned that mantle again while at a restaurant this week, following a man who seized her phone from the table and left.

Serena Williams, the 42-year-old tennis legend confessed that she doesn't know if she will ever play against Gauff. "I mean, let me ask my knees?" she quips at the Thursday, June 13 event.

Serena Williams says it was "very difficult" to compete against her sister Venus before ... 20, would ever play a match. Never miss a story — sign up for PEOPLE's free daily newsletter to ...