4 to Watch: MyKayla Skinner Takes Simone Biles' Spot in Gymnastics Vault Final

Whether you're excited to see who will become the first gold medalist in a new Olympic sport or you need to see Caeleb Dressel hit the pool after his record-breaking swim in the men's 100m butterfly, here's what to watch at the Tokyo Olympics. Xander Schauffele looks to hang onto...