Naomi Osaka emerged from an overnight delay to complete her first-round matchup against Magdalena Frech at the Bad Homburg Open, winning 6-4 6-1 to reach the last 16.

The contest had been paused with the four-time grand slam champion leading 5-4 in the first set on Sunday, due to persistent rain in Germany.

Frech had remarkably rallied to get the set back on serve after going 5-0 down, but the long delay worked in Osaka's favour as she rediscovered her groove on Monday.

Osaka broke at the first opportunity after the restart, taking the opening set, and that was the first of six consecutive games that went her way as she cruised through the second.

Even Frech's lone hold was a difficult one, and Osaka served out the contest to love to tee up a meeting with Elise Mertens or Alexandra Eala – who reached the semi-finals of the Berlin Open last week following top-10 wins over Elena Rybakina and Elina Svitolina. 

Meanwhile, Iva Jovic was forced to withdraw from her scheduled round-one clash with Wang Xinyu due to an ankle injury, just one week out from the start of Wimbledon.

Overnight delay welcomed by Osaka

When rain forced Osaka's meeting with Frech to be postponed, she had lost four consecutive games and was in danger of being taken the distance in an opening set she had initially dominated.

But the long break clearly worked in her favour as she stormed to six straight games upon play restarting, taking all three of her break-point opportunities in that period.

Overall, Osaka won 57% of the total points (71 to Frech's 53), and converted five of her 10 break points, while saving four of the six Frech managed to carve out.

She has already matched her previous best result at Bad Homburg, having advanced to the second round last year before losing in straight sets to Emma Navarro. 

Jovic, meanwhile, faces a race to be fit for Wimbledon after being replaced by lucky loser Renata Zarazua, with the last-minute replacement losing 6-1 6-2 to Wang.