* Day soars into a tie at the top with a 68 * Joins Palmer, who carded a second-round 71 * McIlroy trails by five strokes (Updates at end of round) Aug 30 (Reuters) - Australian Jason Day continued his sizzling form to tie American Ryan Palmer for the lead after the second round of the Deutsche Bank Championship in Norton, Massachusetts on Saturday. They finished level at eight-under 134, one stroke ahead of Americans Matt Kuchar (66) and Billy Horschel (66) on a tightly-bunched leaderboard. World number one Rory McIlroy, slowed by a double-bogey at the par-four 14th where his approach shot bounded 30 yards over the green into a hazard, fired a 69 to trail the leaders by five shots. More...