Question: What was the name of the Brazilian-born, championship frontrunner who retired just before the finish line of the 2009 Valencia Street Circuit in Valencia, Spain?
Sentence (from "2009 Valencia Street GP2 Series round"): Last year's race was quite eventful, with championship frontrunners Giorgio Pantano and Bruno Senna retiring on the last lap, with Senna retiring just before the finish line.
Relevant evidence: Yes