WWE legend John Cena almost broke down in tears during his entrance on tonight's Saturday Night's Main Event. The 17-time World Champion will retire after tonight's show.After a year-long retirement tour, John Cena is set to hang up his wrestling boots after one last outing inside the ring tonight. The Cenation Leader is set to face Gunther. While making his last-ever appearance at Saturday Night's Main Event, Cena nearly broke down in tears. After running down the ramp, Cena was visibly emotional. However, the GOAT kept his cool and went outside the ring to greet WWE legends who were present in attendance for his final match. The 17-time World Champion showed respect to some of his greatest rivals, including Kevin Owens, Rob Van Dam, Kurt Angle, and Booker T, by giving all of them hugs.Check out a clip of Cena greeting WWE legends below:Going into this bout, Gunther has vowed to do something no one has managed to do in years: force John Cena to tap out. Several reports suggest that the 17-time World Champion will put over The Ring General in his final match. However, fans don't want to see Cena lose in his retirement bout.It will be interesting to see what the Triple H-led creative team has planned for The GOAT's final match.