By Jim Maltzman: Shawn Porter is cautioning IBF/WBC welterweight champion Errol Spence Jr. to stay away from him and Terence Crawford for his comeback fight in 2020. Porter is uneasy about Spence (26-0, 21 KOs) coming back too soon against an elite level 147-pound fighter after his car accident from last October. Porter isn’t the only one that has warned ...