Duke point guard Caleb Foster is returning for his senior season, the program announced on social media on Wednesday.The 6-foot-5 Foster averaged 8.3 points, 3.5 rebounds, 2.8 assists and 24.8 minutes in 33 games (30 starts) last season for the Blue Devils (35-3), who won the Atlantic Coast Conference regular-season (17-1) and tournament crowns.