Summer officially begins just after midnight, but the sports summer started Sunday evening as the sun set on Brooks Koepka's win at the U.S. Open. That tournament caps a glorious springtime stretch that includes the Masters, NBA playoffs, NHL playoffs, NFL draft, French Open, horse racing Triple Crown and other events and leads into what can often be a challenging summer for sports fans. The whole season can feel like an appetizer, from NFL training camp to baseball in August to NBA free agency. But worry not, here are 13 sporting events that are worth your time this summer, ranked from can-watch to must-watch.