Zach Johnson has spent decades building a reputation as one of golf's steadiest competitors, and on Saturday he put himself in position for another memorable finish at one of the most meaningful tournaments of his career. The 50-year-old fired a 5-under 66 in the third round of the John Deere Classic to move to 13-under for the tournament, leaving him firmly in contention entering Sunday's final round. While Lucas Glover remained in front after another strong day, Johnson is within striking distance as he looks to capture his second John Deere Classic title.If Johnson can complete the comeback, it would mark his first PGA Tour victory since winning The Open Championship in 2015 and add another chapter to his remarkable history at TPC Deere Run.MORE: Where to watch John Deere Classic golf: