For Serena Williams’ first 26 matches at major tournaments in 2015, no deficit was too daunting, no opponent too troublesome, no victory too far from reach.
She was unbeaten and, seemingly, unbeatable, nearing the first Grand Slam in more than a quarter-century. All Williams needed was two more wins to pull off that rare feat. And yet, against an unseeded and unheralded opponent in the U.S. Open semifinals, she faltered. Her pursuit of history ended, oh so close.