Japan lost to world No. 4 Serbia 119-100 in men’s basketball on Sunday when the women’s team was also beaten, 75-65, by Belgium in their final Paris Olympics warm-up games. Los Angeles Lakers forward Rui Hachimura sank a game-high 29 points, and former National Basketball Association player Yuta Watanabe returned from a left calf injury to start and score 10 points in 26th-ranked Japan’s promising showing in Belgrade against a Paris medal hopeful. “It was a big step forward. It wasn’t a bad game playing away to a strong team,” Japan head coach Tom Hovasse said after facing Serbia, runner-up at…