Solo Sikoa is set to face a mystery opponent tonight in the "Last Time is Now" tournament match on RAW. Speculations have been running wild among the fans regarding who it could be. While there are several notable names in that rumor list, including Joe Hendry and Oba Femi, the one name that could actually show up tonight against Sikoa is a former WWE star.Nic Nemeth could make a shocking return to WWE tonight at Madison Square Garden after 788 days. He could be revealed as Solo Sikoa's mystery opponent on Monday Night RAW. Formerly known as Dolph Ziggler, the 45-year-old has a storied history with John Cena. He fought side by side with The Cenation Leader and also battled against him numerous times.Therefore, Ziggler's addition to the ongoing tournament would make perfect sense. Ever since getting released from WWE in September 2022, The Showoff has made a name for himself in other promotions, including NJPW and AAA, and is currently part of TNA. Dolph Ziggler's homecoming has the potential to sweep fans away in nostalgia, giving rise to a massive pop.Tonight's episode of RAW will take place in the iconic Madison Square Garden, and the company is going all out to make it an unforgettable night. Hence, there is a good possibility that Triple H could bring Nic Nemeth back for one night, pitting him against Solo Sikoa. WWE and TNA have been working comprehensively of late, which makes Nemeth's return a plausible scenario.However, this is currently speculation, as it remains to be seen what happens tonight. Regardless of who the mystery opponent will be, fans can expect major surprises tonight on RAW.Solo Sikoa to overcome the odds and advance in the tournament?Solo Sikoa has been riding on red-hot momentum since reviving the MFT. He has been dominating Friday Night SmackDown and is at the top of the game lately. However, many believe that his momentum might take a hit tonight with Sikoa suffering a huge defeat on RAW against his mystery opponent.However, WWE's creative head, Triple H, might negate that theory. Regardless of who his opponent is, The Street Champion might grab a huge victory tonight at Madison Square Garden. He could go on to advance in the 'Last Time is Now' tournament.The company has been building Solo Sikoa as a legitimate threat and a dominant leader lately. A massive defeat on RAW could deflate all the momentum he has been building for months. Besides, it could pose a huge question mark on his credibility and his position within his faction.Hence, WWE might not risk that at this point. Sikoa advancing in the tournament will help him be in the spotlight. However, it all depends on what Triple H has in store for the former United States Champion.