Athletics at Arizona Diamondbacks (2026-07-22). Gage Jump vs Merrill Kelly at Chase Field.
Starters — Gage Jump enters with a 3.78 ERA, 1.32 WHIP, and 52.1 innings, backed by 9.63 K/9, 2.92 BB/9, and 0.69 HR/9. His last three starts were uneven: 3.2 IP, 3 ER, 8 K, 2 BB on July 17; 5.2 IP, 1 ER, 7 K, 2 BB on July 11; and 3.0 IP, 5 ER, 1 K, 3 BB on July 5. The strikeout rate is a clear positive, and the low home-run rate helps, but the recent form is tagged as a downward trend because of inconsistent length and command from outing to outing. Merrill Kelly has a 5.20 ERA, 1.49 WHIP, and 98.2 innings with 5.66 K/9, 3.65 BB/9, and 1.92 HR/9. His last three starts have been much sharper: 5.0 IP, 1 ER, 3 K, 2 BB on July 17; 7.0 IP, 1 ER, 6 K, 3 BB on July 9; and 5.0 IP, 2 ER, 6 K, 2 BB on July 4. Even with the season-long damage in ERA and home-run rate, his recent run prevention has improved, and the listed trend is also down, reflecting that his baseline indicators still carry risk despite better recent results.
Teams — Oakland brings a .731 OPS, .247 average, and 453 runs, which is the stronger offensive profile in this matchup. The concern for bettors is the supporting pitching staff, which has a 5.29 team ERA and 1.48 WHIP, plus a 2-8 record over the last 10 games. Arizona owns a .694 OPS, .238 average, and 441 runs, so the lineup has been less productive overall, but the broader team profile is steadier because of a 4.21 ERA and 1.28 WHIP. The Diamondbacks also come in on a 7-3 run over their last 10, which points to better current form on both sides of the ball.
