Freshman year, varsity district track meet. Ran a 10:18 (18 seconds below my pr) for second place in the 3200 a couple days before. On the bus to the meet (the day i was running the 1600 final) I kept envisioning myself way back on the last lap. first place way out there, second not to far back, but me, 50-75m back. But i caught up on the final stretch to squeeze out second place. Same vision every time, not that i wanted that scenario neccesarily.
Race went down just like the dream, still remember the splits (66,216[70],330[74],435[65]) years later (im 19 now). last lap i was way behind, like 50+ meters with 300 to go, almost 75m behind first. They were both dying, my teammates screaming from the sidelines, caught 2nd place around the bend, 100m to go i nudged him out and lost to 1st place by like .7) Mom was in the stands screaming (got on video thankfully, she past away 2 years later), freinds going nuts. 4x400 team saying it was awesome and they wanted to kick ass cuz i did, unfortunately did not happen, our district was stacked, but it was awesome to watch.
Envisioning your race how you want it to happen helps apparently. Was my pr, still is my pr after i blew out my knee when i was 17.