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

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.

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