Weekend in Sport: Federer comes up short in Melbourne; Lacazette leads dominant Arsenal over Chelsea; Mayweather-Pacquiao II mooted

    Swiss superstar Roger Federer looks on in his fourth round match against Stefanos Tsitsipas of Greece.

    (CNN)Reigning Aussie Open champ Federer beaten by young gun... Arsenal dominates Chelsea for crucial Premier League win... Shiffrin continues dominance in Italy... Pac-Man calls out Mayweather after dominating Broner. This is your weekend of sport.

    Federer crashes out... but can anyone stop Djokovic?

    Swiss legend Roger Federer looks on in his fourth round match against Stefanos Tsitsipas of Greece.