Novak Djokovic through after Nikolay Davydenko retires

Novak Djokovic has advanced through to the quarter-finals of the Cincinnati Open after Nikolay Davydenko was forced to retire during their third-round encounter.

The Serbian second seed tore his Russian opponent apart 6-0 in the opening set.

However, Davydenko withdrew from the match before the start of the second with a shoulder injury, having called on his trainer during the break.

Next up for Djokovic is a match with Croatian 12th seed Marin Cilic.