Affectionately known as "Jaja" (slang for a glass of wine; when he continued drinking wine as a professional, the nickname stuck because of the similarity to his name), he won many one-day and stage races and was ranked number 1 in the world in 1995, 1996, 1997 and 1999.

Although he never won the Tour de France, where he suffered altitude sickness, he won the Vuelta a España in 1995; as well as the leader's jersey, he won the sprinter's jersey and climber's jersey in the same race — only the third rider to have done this in a Grand Tour. With Alessandro Petacchi, Eddy Merckx, Djamolidine Abdoujaparov and Mark Cavendish, he is one of only five riders to win the points classification in all three grand tours.

He turned professional with the French Toshiba team in 1989 and quickly established himself as a daring sprinter. He moved on to the Spanish ONCE team under Manolo Saiz, where he reinvented himself as an all-rounder capable of winning one-day races and the tours.

A catalyst was an accident at the finish of the 1994 Tour de France stage in Armentières. A policeman leaned out and several riders hit him. Jalabert was flung into the air and his bicycle was destroyed. He injured his face and promised his wife to change his style of riding. It only took a short while.

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