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Why Mad Dog thinks Serena's chance of winning another major is over (1:23)

Serena Williams has a chance of winning an elusive 24th major. There is a time and a place for it.

Two weeks after returning to action at Wimbledon after a year away, Serena Williams has decided to play in the Toronto tournament.

After losing in the first round of Wimbledon for the second year in a row, Williams decided to use her protected ranking to enter the main draw.

Williams, a three-time winner of the event, broke down in tears due to back spasms that forced her to retire 19 minutes into the match.

The entry list for the Toronto tournament has 41 players ranked in the top 43 on the tour.