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In page Luis Ocaña:

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The following year, 1972, Merckx had intended on not participating in the 1972 Tour de France in order to ride the Vuelta a España for the first time, but due to critics saying that Merckx only won the Tour because of Ocaña's fall, Merckx decided to ride. There was speculation of a duel. Ocaña had won the Critérium du Dauphiné Libéré and the national championship. In the Pyrenees, Ocaña repeatedly attacked Merckx without success, before withdrawing with bronchitis.