MLB

The best angle is the full-game under because the market is not fully accounting for how often Boston can control games with run prevention, while Kansas City has struggled to sustain offense away from home. Boston owns the better batting line, the better ERA, the better WHIP, and a far stronger bullpen. That combination gives the under room to work even if the Red Sox do enough to win. The starter data also supports a tighter game early. Dobnak has recently worked deep enough to keep opponents in check, and Suarez is coming off a scoreless outing with seven innings of work. If both starters handle the first trip through the order, the game can stay below the number even if Boston pulls away late against a weaker Royals relief group.
Boston enters with the stronger run differential, a better home record than Kansas City has on the road, and a more dependable relief corps. The Red Sox lineup has been more productive in average, on-base rate, and run scoring, while the Royals have been closer to average at the plate and much worse on the mound. Kansas City can still create traffic with speed, but the gap in overall pitching quality is the biggest reason Boston has the edge. Recent form also points in Boston's direction. The Red Sox are 5-5 in their last 10 and have been stronger on the road overall than at home, while Kansas City is 4-6 in its last 10 and has been much more vulnerable away from home. That split matters here because the Royals have a far tougher path to stringing together enough runs against a staff with better strikeout, walk, and contact suppression numbers.
Ranger Suarez is listed at 6-4 with a 3.44 ERA and 122 strikeouts. The recent note on him is encouraging, as he is coming off seven scoreless innings against Baltimore, which suggests his command and ability to limit hard contact are trending in the right direction. Against a Kansas City lineup that has been less productive on the road, Suarez has a strong chance to keep the game quiet early and give Boston a stable first six innings. Randy Dobnak is listed at 3-3 with a 2.54 ERA and 43 strikeouts. He has allowed three earned runs or fewer in four of his last five starts and has worked 27 2/3 innings over that span with 24 strikeouts, which points to solid recent form even if the strikeout totals are not overpowering. The problem is the larger season context around Kansas City, since the Royals have been less effective offensively on the road and their bullpen has been hit harder than Boston's. That makes Dobnak useful in the early frames, but not enough to fully tilt the matchup.
Boston has the cleaner overall profile, with better batting marks, better pitching numbers, and a stronger bullpen than Kansas City. The Royals can keep this close for stretches because Dobnak has been steady lately, but the Red Sox still own the more complete run-prevention setup and the better chance to do damage against a bullpen that has been less effective. The projected result is Boston 5, Kansas City 3, which supports the under and keeps Boston as the more likely winner.