MIAMI — What a difference a night makes. Or, maybe more accurately, what a difference a pitcher makes. Spared — for a day, with tough right-hander Pablo Lopez on deck Saturday — having to face the National League ERA leader, the Giants lineup exploded for season highs of five homers and 15 runs, a day after they were blanked and held to just three hits in a series-opening loss. Their 15-6 win Friday night improved their record to 4-4 on their current trip with two more to play. A game of openersThe Giants’ offensive onslaught ensured that it wouldn’t matter who was wearing orange and black on …