2015 — Lydia Ko, 17, becomes the youngest golfer, male or female, to be ranked No. 1. She shares second place at the LPGA Tour’s season opener, where she finishes a shot behind Na Yeon Choi.
The major league rules committee mandates that pitchers must have access to a rosin bag. 1971 — UCLA starts its 88-game winning streak with a 74-61 win over UC Santa Barbara.