Toronto Blue Jays second baseman Marcus Semien played hero Friday night, hitting a walk-off three-run home run to beat the Oakland Athletics 11-10 in the ninth inning. It was his only hit in five at-bats, but it was arguably the biggest of the night. Semien has been a key contributor for the Jays all season, slashing .266/.333/.529 with 34 HRs, 81 RBI, 94 runs, and 14 SBs at the top of their lineup. He's a great fantasy asset in every league and is a must-start at a weak second-base position.