(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.
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.