A year ago in Cancun, Iga Swiatek was the player to beat despite Sabalenka’s No. 1 ranking. She duly destroyed the field, thrashing Sabalenka in the semifinals en route to winning the title undefeated and reclaiming the top spot. Sabalenka had been there eight weeks — even less in her memory. “It was like what, one week? Two?” she said.