The Boston Red Sox survived a scare in their first World Series game at Coors Field, and now are on the verge of their second championship in four years. The Red Sox can complete their second straight World Series sweep with a win over the Colorado Rockies in Game 4 on Sunday night at Coors Field. The 22 previous teams that took a 3-0 World Series lead all went on to win - including the Red Sox in 2004, when they took four in a row from the St. Louis Cardinals to win their first title since 1918. Boston's Jon Lester and Colorado's Aaron Cook each overcame life-threatening illnesses to get back to pitching in the majors. They will square off in what arguably is the biggest game of their respective careers. Lester overcame cancer that cut short his 2006 season and jeopardized his career. Cook left a home game in 2004 suffering from dizziness, and was in an operating room a month later to remove a rib that was pressing against a vein and causing blood clots in his lungs. "It's tough enough to get here, and what we've been through, just to keep our focus, keep our faith, and just realize - I'm sure (Lester) realizes, too, without me talking to him that baseball is not the most important thing, and once you realize that baseball is not the most important thing in the world, you're able to relax, put it back in perspective, play it like a game and just have fun," Cook said.