This serve should also enable Opelka to keep matches close as an underdog .
It 's worth noting that three of Opelka 's seven career defeats as a 2.00 - 2.99 underdog on hard or indoor hard courts came with just a one or two game margin .
This serve should also enable Opelka to keep matches close as an underdog , and it 's worth noting that three of his seven career defeats as a 2.00 - 2.99 underdog on hard or indoor hard courts came with just a one or two game margin .