Andrea Petkovic, who is playing doubles with Ana Ivanovic in Miami, says that the two have side bets going on during their matches.
"I won 20 bucks," Petkovic said. "Ana, I think she shed one tear, because I hit aces. Today I hit on set and match point. I was so proud. Yesterday like in the first or second game I hit three aces, which is 15 bucks already. Ana and I have a bet: every time you hit an ace you get 5 bucks, and we exchange money. Also on decisive point I hit return winner, which is also 5 bucks, so 20 bucks all in all. I think she had one ace and one important volley, so that was $7 so $13."—Matthew Cronin