Frances Tiafoe, Denis Shapovalov tumble in Tokyo openers
No. 7 seed Dennis Shapovalov and No. 8 Frances Tiafoe let their leads slip away in first-round upsets on Wednesday at the Japan Open in Tokyo.,ShapovaNo. 7 seed Dennis Shapovalov and No. 8 Frances Tiafoe let their leads slip away in first-round upsets on Wednesday at the Japan Open in Tokyo.,Shapova