Cincinnati Reds vs Seattle Mariners Betting Pick & Prediction for 7/21

MLB game preview

The Cincinnati Reds will take on the Seattle Mariners in an MLB regular season game. The Reds have a record of 45-53 and sit fifth in the NL Central. They are coming off a win and have a 5-5 record in their last ten games. The Mariners are playing at home with a record of 50-50. They are second in the AL West, having won their last two games but are 4-6 in their last ten games.

The game will take place at T-Mobile Park in Seattle. The stadium has a retractable roof, which might be beneficial given the forecast of scattered clouds and a very hot day. The game is scheduled for Tuesday, July 21, 2026, at 9:40 PM. Chase Burns will start for the Reds, boasting an 11-1 record with a 2.54 ERA. For the Mariners, Luis Castillo will take the mound with a 3-8 record and a 4.93 ERA.

Cincinnati Reds Team Preview

The Cincinnati Reds have had a mixed performance in their recent games. They won against the Colorado Rockies on July 19th, scoring 9-6, with four home runs. However, they faced a loss on July 18th with a 10-3 score against the same team.

The Reds’ batting lineup features Elly De La Cruz and Sal Stewart as strong performers. De La Cruz has a .282 batting average with 16 home runs, while Stewart has a .253 average with 20 home runs. Both players contribute significantly to the team’s offense.

Chase Burns is the probable starting pitcher for the Reds in the upcoming game against the Seattle Mariners. Burns has a record of 11-1 with a 2.54 ERA this season. His performance on the mound will be crucial for the Reds in their next game.

Reds vs Mariners Game Day Info

  • Sport: MLB
  • Teams: Cincinnati Reds vs. Seattle Mariners
  • Venue: T-Mobile Park in Seattle, WA
  • Date: Tuesday, July 21, 2026
  • Betting Odds: Reds Moneyline -105, Mariners Moneyline -115, Reds Runline -1.5 (+166), Mariners Runline +1.5 (-201), Total Over/Under 7.5 (-110)

Seattle Mariners Team Preview

The Seattle Mariners have been on a roll recently. They secured wins against the San Francisco Giants on July 18th and 19th. Cole Young played a key role in these games, contributing a home run and multiple RBIs.

On July 19th, the Mariners’ starting pitcher, Logan Gilbert, delivered a strong performance. He pitched six innings, striking out ten batters and allowing three earned runs. This helped the Mariners to a 6-3 victory over the Giants.

Despite some losses, the Mariners’ pitching staff has shown promise. With an ERA of 3.61, they rank 7th in the league. Their ability to keep home runs to a minimum has been crucial, as they lead the league in that category.

BTB Betting Pick

The moneyline pick for this game is the Mariners at -115. Their pitching staff has a strong earned run average of 3.61, ranking 7th, and they have given up the fewest home runs this season. The Reds have a higher earned run average of 4.58, ranking 22nd, which may give the Mariners an edge in this game.

For the over/under pick, consider taking the under at 7.5 (-110). The Mariners’ pitching ranks well, with a batting average against of .239, placing them 10th. The Reds’ batting average is .231, ranked 22nd, suggesting runs may be limited in this game. The projected score could be close, with the total likely staying under the line.