Sergey Kovalev believes he overtrained for first bout with Andre Ward

LAS VEGAS — Sergey Kovalev was in control.
He knocked Andre Ward down in the second round, and was dictating the action with his measured jab.
Then Round 5 hit and Kovalev felt … different.
Kovalev said he was exhausted, that he felt like he left everything in training camp. The 34-year-old Russian says a month before the fight, he knew: his gas tank was empty.
Under the direction of a strength and conditioning coach that both Kovalev and Main Events CEO Kathy Duva couldn’t re