evidence: MORE: Why Indiana's Caitlin Clark was left off USA Olympic team [...] Reese still would have her work cut out as the top alternates are reportedly Indiana Fever guard Caitlin Clark and Connecticut Sun center Brionna Jones. [...] 3x3 is a half-court variation of basketball. In addition to being 3-on-3 in the halfcourt, a few major rule differences exist in the world of 3x3.