Last season I won my first WS with my Seattle team. Lost the division title on a tiebreaker so we were the 5th seed. The team played well all season but I didn't think I had a WS caliber team in a tough world, but things just kept going my way.
1/ My rookies/young players carried their weight. None were stars but they didn't crap the bed.
2/ My starting catcher was a guy I found without a contract in the middle of the previous season. He outhit his ratings for a full season and a half. And his defensive ratings are more DH caliber than C.
3/ My two best regulars, for the first time ever, kept hitting all the way through the playoffs. Every season before they'd gotten beat by better pitching in the playoffs. This time they finally lived up to their ratings.
4/ I had two stud SPs plus one rookie SP who pitched really well at home, but poorly on the road. With the off days in the playoffs, I was adjusting my rotation every day to make this work out. Every other SP I started got lit up. In the WS, I started my top stamina SP in games 2, 5 and 7. I can't stress enough - literally almost every pitching move I made worked out.
I'm not saying any of this to say look at me, I was a great manager. What it means is that for me to win that WS, pretty much every single thing that needed to work out in my favor, did.