I played my first proper game of SC2 in a while and wasn't expecting to do fantastically, but I had done my placement game back on the 1st and was moved from Bronze to Silver, so I'm not exactly a great player. PvP on Metalopolis, I saw that he was 4gating and paniced as I don't 4gate, I go for a tech play instead, so I quickly got out loads of sentries instead of going straight for my tech play, and managed to keep my ramp blocked off with a forcefield and picked off tons of his units each time he tried to push in. After a few tries, he seemed to give up, so I assumed he was getting an observer up to see up to my high ground, so got one of my own and kept building stalkers, sure enough in came an observer, forcefield up, killed the obs and a couple more of his stalkers.
Back at the start of the game, I'd kept my scouting probe hidden in his base behind the fog, so stuck down a pylon and went for DTs, built a couple and send them into both bases mineral lines and killed a ton of probes before he could finally deal with them.
Eventually I just built a ton of stalkers and colossi and kept denying him expansions, engaging his armies before running away as his reinforcements arrived, and eventually won. It wasn't a smooth game by any means but if felt great, especially since I was playing so poorly!