(AP) — Roger Federer took a look around as he entered the stadium court at the Miami Open, already feeling the energy of the crowd. The first break put him up 5-3 in the first set, and Federer then fought off four break points in the ensuing game before closing out the set. Another break for a 3-2 lead in the second set, not long after del Potro got his oft-problematic left wrist taped on a changeover, put Federer in full control. Serving at 4-3, Federer faced a break point — Argentine fans serenaded del Potro beforehand with Ole! The stadium court, largely empty for the first two matches of the day, was filled — with huge roars greeting both players as they entered for warmups, many fans wearing hats or shirts with Federer's "RF" logo, many others either donning Argentine soccer jerseys or carrying that nation's flag in support of del Potro. The last seven Federer-del Potro matches coming into this meeting all went the distance, with some classics — the 4 1/2-hour, three-setter at the 2012 Olympics at Wimbledon where Federer prevailed 19-17 in the third, Federer rallying from two sets down in the French Open quarterfinals that year, and del Potro winning the 2009 U.S.