By Jake Levin @JakeLevin09  HOPKINTON -- Since taking over as the head coach of the No. 7 Medfield Warriors in 2012, John Isaf's teams have racked up seven straight Tri-Valley League titles entering Monday’s TVL matchup with No. 20 Hopkinton. Medfield would add another one to the trophy case on yesterday evening, as the Warriors delivered a 14-12 win over the Hillers, in a game that saw both teams withstand monsoon-like conditions, a 30-minute thunder and lightning delay, and once the skies cleared -- each other's best shot.   "We go hard every day," Medfield middie Tommy Gill said after the TVL’s - Large Division title became official. "We're always working. We've

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