PARIS — The burgeoning careers of Madison Keys and Sloane Stephens have often run parallel.
The two friends made breakthrough runs to Australian Open semifinals just before their 20th birthdays. Both reached their first Grand Slam final at last year’s United States Open, which Stephens won in straight sets.
On Sunday at Roland Garros, each reached the quarterfinals of the French Open for the first time to complete a quartet of sorts. For Keys, 23, and Stephens, 25, the milestone meant that they had both advanced to the quarterfinals or better at all four Grand Slam events.