LONDON: World number one Aryna Sabalenka stepped up her bid for a maiden Wimbledon title with an impressive straight-sets victory over Jelena Ostapenko on Friday. The Belarusian was too strong for Latvia’s Ostapenko, winning 6-4, 6-4 to book a last-16 tie against fellow four-time Grand Slam champion Naomi Osaka on Sunday. Sabalenka will be bidding to reach a 15th consecutive Grand Slam quarter-final, but former world number one Osaka has impressed so far in reaching the fourth round at the All England Club for the first time. “Another aggressive player. Another very powerful match.