For the second time in the last two years, these Atlantic Coast Conference rivals will meet for a third time in the season. Maryland is 59-20 against Duke. The two sides split their earlier contests with the Terps winning, 10-7, on March 3, and the Blue Devils returning the favor with a 6-5 decision in the ACC tournament semifinal on April 20. No. 3 seed Duke (15-4) defeated Syracuse, 12-9, in the first round and Colgate, 17-6, in the quarterfinals. Maryland (11-5) upended No. 7 seed Lehigh, 10-9, in the first round and No. 2 seed Johns Hopkins, 11-5, in the quarterfinals. Here are a few factors that could play a role in the outcome of this NCAA tournament semifinal at Gillette Stadium in Foxborough, Mass., Saturday evening.