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.
    They say: never meet your heroes. Stefanos Tsitsipas might disagree.
      The 20-year-old Greek ended the reign of his boyhood idol Roger Federer in Melbourne Sunday when he defeated the twice-defending champion 6-7 (11-13) 7-6 (7-3) 7-5 7-6 (7-5) at Rod Laver Arena, advancing to a maiden grand slam quarterfinal.
      With Andy Murray crashing out in the first round, it hasn't been a vintage year for the Big Four of men's tennis' \ -- down to three now, with Murray's impending retirement.
      As the opening major of the calendar heats up, it's increasingly likely this is the year that their dominance wanes -- in another next gen triumph, 21-year old American Frances Tiafoe played the match of his nascent career to oust 20th seed Grigor Dimitrov 7-5, 7-6(6), 6-7(1), 7-5 to secure his spot in the quarter-finals.
      Frances Tiafoe of the United States  serves in his fourth round match against Grigor Dimitrov of Bulgaria.
      But elder statesman Novac Djokovic, who has only dropped one set on his way to the final thus far, is showing no signs of slowing down.
      The Serb, top-seeded in Melbourne, meets 22-year-old Daniil Medvedev in the Round of 16 Monday. Squeaking into the top 20, the young Russian hasn't faced any real opposition thus far in Melbourne, but will need to outdo Tsitsipas' giant-killing Sunday to knock the serial winning Djokovic off his perch.

      Rams, Pats to face off in Super Bowl

      The Los Angeles Rams celebrate after kicking the game winning field goal in overtime against the New Orleans Saints in the NFC Championship game.
      LA Rams head coach Sean McVay was a callow teen the last time the Rams made it to football's biggest game. But now -- in part due to a shocking refereeing decision -- he has the chance to