Rubens Sambuenza's goal and overall play for Toluca surely had some at Club America feeling regret. Pedro Pardo/AFP/Getty Images

Here are five talking points from round 12 of matches in the Liga MX:

1. Sambueza ends Club America's undefeated streak

After 11 games unbeaten this season, Club America suffered its first defeat on Saturday, falling 2-1 to Toluca thanks in no small part to former Las Aguilas player Rubens Sambueza.

Sambueza is the type of player who can infuriate the opposition with his play-acting, cunning and frequent moments of genius. He was therefore, perhaps naturally, a favorite with Club America fans in his four years at the club, and he had an important role in bringing two Liga MX titles and two CONCACAF Champions League trophies to Estadio Azteca.

But letting Sambueza go ahead of the 2017 Clausura was widely criticized by America fans, and on Saturday's evidence, you can see why. The 34-year-old scored the equalizer after Renato Ibarra had handed America a second-minute lead and then assisted the late Toluca winner.

It was a man-of-the-match performance from Sambueza, although Toluca's job did become easier after America's Bruno Valdez was sent off in the 35th minute for a brusque challenge on Alexis Canelo.

This was a game that felt like a playoff match, with both sides putting everything on the line. There were a total of 10 yellow cards, America coach Miguel Herrera and Toluca's Hernan Cristante each were sent from the bench following a slightly comical scuffle between the two of them and there was no shortage of intensity.