SAN FRANCISCO — All of a sudden, a lot is going right for the Giants.Mac Williamson and Brandon Belt homered, Sam Dyson continued his comeback from a spring full of problems and Hunter Strickland closed it out as the Giants beat the Nationals 4-3. They've won four of five and have taken two series in a row after a slow start to the season. 3-Alarm Fire Rips Through Concord Building; 250 Displaced The Williamson thing is becoming a nightly deal. Ditto for Belt. But Dyson was a new wrinkle. He looked like a DFA candidate a week ago but has thrown well since, and he got through the heart of the Nationals' order in the eighth to preserve a one-run lead.Here's what else you need to know from the day Bruce Bochy joined Twitter… South Bay Girl at Center of Potential Cancer Breakthrough Immediate impact: Tanner Roark tried to flip a first-pitch curveball up there when Williamson came up with two outs in the sixth. The ball came in at 74 mph and screamed out to center field at 109.2 mph. The Giants have four homers this season of at least 109 mph and Williamson — who has been here for five games — has three of them.No worse for wear: Williamson (and the lineup)...