Ben Shelton has reached his first major semifinal by beating Frances Tiafoe in four sets at the U.S. Open. It was the first Grand Slam quarterfinal between two African-American men in the professional era. After a victory that ended after midnight on Wednesday, the 20-year-old Shelton will face 23-time Grand Slam champion Novak Djokovic on Friday for a berth in the final. Djokovic reached his record 47th Grand Slam by defeating Taylor Fritz 6-1, 6-4, 6-4 on a steamy Tuesday afternoon. Djokovic improved to 13-0 for his career in quarterfinals at Flushing Meadows — and to 8-0 against Fritz, an American who was seeded No. 9.