Question: What is the nickname of the driver who was replaced by Jenson Button and Kevin Magnussen?
Sentence (from "McLaren MP4-29"): The car was unveiled on 24 January 2014, and was driven by World Drivers' Champion Jenson Button and debutant Kevin Magnussen, who replaced Sergio Pérez, after he won the 2013 Formula Renault 3.5 Series title.
Relevant evidence: Yes