It’s day 3 here at the Gerry Weber Open in Halle, Germany, an ATP 500 event, and we have four interesting matchups today including Roger Federer (SUI) vs Ernests Gulbis (LAT) as the match of the day. The 1st match of the day Florian Mayer (GER) beat Steve Johnson (USA) in straight sets, 6:3/7:6(4) and…