CURRENT IN SPORTS

• Neither of Arsenal, Chelsea's striker systems is working

  Neither Arsenal nor Chelsea have an effective lone striker, so the Gunners field two and the Blues none. It's not working for either London club.

• Serena, Osaka reach fourth round of Aussie Open

  Serena Williams continued to cruise at the Australian Open on Saturday as she overwhelmed Dayana Yastremska to reach the fourth round. Naomi Osaka lost her first set before rallying past Hsieh Su-wei to advance.

• Djokovic, Nishikori roll into Aussie fourth round

  Novak Djokovic topped rising Canadian Denis Shapovalov 6-3, 6-4, 4-6, 6-0 to guarantee that he'll keep his No. 1 ranking after the Australian Open. Kei Nishikori also advanced with a straight-sets win over Joao Sousa.

• Lukaku's Utd dilemma similar to mine - Solskjaer

  The Belgian has so far been restricted to a bit-part role under Solskjaer, with the Norwegian putting his faith in a youthful front three.

• Tomic to take legal action against Hewitt

  Bernard Tomic's father says he will begin legal action against Davis Cup captain Lleyton Hewitt over an incident he alleges happened nine years ago.

• 'Impossible' for Spurs to find another Kane - Poch

  With Kane sidelined, Son Heung-Min at the Asian Cup and Lucas Moura "90 percent out" Spurs are in a striker bind ahead of their match with Fulham.

• Kerr says Warriors won't slow down for Cousins

  Coach Steve Kerr says Golden State won't adjust its fast-paced offense to account for the addition of DeMarcus Cousins, who will return Friday against the Clippers after missing nearly a year because of a torn Achilles tendon.

• Messi joins up with Liga MX side Atlas... well kind of

  Atlas tried to be clever posting an Instagram welcoming Lionel Messi. In the end the joke was on them, rival fans poking their history on Twitter.