SAN DIEGO — Count Caroline Wozniacki among all those mothers who re-enter the workforce, striving to find that tricky balance between parenting and the things that bring in a paycheck. Wozniacki, 33, stepped away from professional tennis for three and a half years. She turned pro at 15 and was ranked No. 1 in the world for 71 weeks, two more than Venus Williams, Tracy Austin, Kim Clijsters and Jennifer Capriati combined. It was her life until, well, life came along. Despite an enormous amount of winning, including the Australia Open title in 2018, Wozniacki wanted children. The racket gathered…