At WrestleMania XXVI in 2010, popular wrestler Shawn Michaels retired following a loss to The Undertaker. In August 2011, WWE began to phase out the brand extension when they gave Raw the tagline "SuperShow", meaning wrestlers could appear on both Raw and SmackDown. The year 2011 saw a highly acclaimed feud between the company's two most high-profile superstars at that point, John Cena and CM Punk. Their match at Money in the Bank on July 17, 2011 was named one of the greatest matches in WWE history. Punk, who had become a top star during the summer of 2011 due to his infamous "pipe bomb" promo, would hold the WWE Championship for 434 days before losing to The Rock in 2013 at the 2013 Royal Rumble, a reign recognized by WWE as the sixth-longest championship reign of all time and the longest in 25 years. The Rock defended the championship until he was defeated by John Cena at WrestleMania 29 in a rematch from their bout the previous year. Popular stable The Shield was prominently featured during this period. On December 15, 2013, the World Heavyweight Championship and WWE Championship were unified in a Tables, Ladders and Chairs match between John Cena and Randy Orton, which Orton won and the unified championship was briefly called the WWE World Heavyweight Championship, but would soon be renamed as just the WWE Championship.