Another good example is Brett Hart-Shawn Michaels from Survivor Series 92.
At the time, HBK was just a few months into his singles career and the transformation from teeny bopper tag team Rock & Roll Express rip off guy to legit main event caliber star. Although Michaels initial heel turn and singles career got off to a great, well orchestrated start, he was languishing in a comedy feud with Rick Martel. His IC Title win over a heavily pushed British Bulldog seemed like a swerve, an unexpected upset. Hart was barely two months in his 1st run as World Champ, basically getting the title with no set up (despite a very well drawn rise up the card over the previous two years) due to Ultimate Warrior's firing & Ric Flair's injury (caused by Warrior). Though S-Series was a premiere event and the match was for the World Title, the set up and storyline was an after thought compared to the "other " main event, a tag match featuring Scott Hall (in the midst of a major push after signing from WCW), Flair (returning to after a 6 week injury related abscence), Randy Savage (who spent much of the year as World Champ) and Curt Henning (in his 1st match in over 2 yrs after a near career ending back injury). Considering all those factors, this bout, the first major tilt between these two, didnt at the time look on paper like it would be anything more than an entertaining but not historically important match.
The match was definately entertaining, and it showed that HBK's character could be a very effective heel, more than the comedy act he and Martel were doing previously on the mid card. More than that, this was the first major tilt in what would become the defining feud of both men's HOF careers, a near decade long battle on TV, at the house shows, and behind the scenes. Looking back, this bout stands as one the most important in the creation of their rivalry as well as HBK's ascension to the top tier of WWE, Getting the audience to take him seriously in that role. Given how this match looked and was promoted at the time, this is an excellent example of a match that became far more important historically than it was initially.