#2: Samoa Joe

Fans have been desperate to see these two men go one on one ever since Joe arrived in the company last February, and the WWE would be wise to pull the trigger on the match before Cena's appearances become even more limited.
Joe is on fire at the moment, and he a headlining slot at SummerSlam would be considered by many as a just reward. While the former TNA and ROH World Champion is a big star, he is still without a distinctive PPV victory to really cement his place at the top of the card.
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Joe Cena is, for many fans, a dream match, and the two would no doubt put on a bout for the ages. Joe's rumoured upcoming pursuit of the WWE title could also be linked into the match, with Joe using a victory over Cena as an excuse to compete for the company's top prize.