Sat Terrigal trotters 10k tt

Decided to just run on feel. Did about 2k as a warmup then when we got racing I ran comfortable but still hardish.I was leading for the first km then Adrian ran right on past me which suited me fine as I wanted some to try & chase. I'm not a fan of leading. I stayed about 5seconds behind him until he stopped at 3k mark. DAMN! Now I'm in front on my own. I guess I slowed down a bit then. Got to the turn around & noone was in sight anywhere. Saw Thomas in 2nd spot about 90sec behind me. Slowed again then as I thought I'd win this. About 2km to go my right groin that I had trouble with leading into GNW was getting sore. Slowed down again. Finished in 1st spot in 39:08. I think I could've got 50seconds quicker if I had someone to run with