Gentry spend just two seasons in the Mets' farm system when he caught the eye of Mets managerGil Hodges in Spring training, and earned a spot on the opening day roster behind Tom Seaver & Jerry Koosman in the starting rotation. He came within an out of a complete game in his major league debut, defeating the Montreal Expos in front of 8,608 at Shea Stadium. Overall, Gentry made 35 starts, and went 13-12 with a 3.43 earned run average and 154 strikeouts his rookie season. Unquestionably, his biggest game came on September 24. The Mets, who once trailed the Chicago Cubs by 9 games on August 13, were now in first place by six games, and now regularly drew crowds over 50,000 to Shea. Gentry pitched a four-hit, 6–0 shutout against the St. Louis Cardinals to clinch the National League East title for the Mets. On his 23rd birthday, Gentry was sent to the mound for game three of the 1969 National League Championship Series against the Atlanta Braves. Gentry lasted only into the third inning, however, the Mets were able to mount a comeback that would allow them to sweep the NLCS, and head into the World Series against the Baltimore Orioles. With the 1969 World Series tied at one game apiece, Gentry faced Jim Palmer in game three. Tommie Agee led off the bottom of the first inning with a home run to give the Mets the early 1-0 lead. Gentry, meanwhile, held the mighty Orioles scoreless, pitching into the seventh inning before handing the ball to Nolan Ryan for the save. He also helped his own cause in the second inning with a double that plated two runs. Gentry got off to a hot start in. Following a one-hit shutout of the Chicago Cubs on May 13, his record stood at 4-1 with a 1.71 ERA. He would cool off from there, and ended the season at 9-9 with a 3.68 ERA. Following a season in which Gentry went 12-11 with a 3.23 ERA, the California Angels inquired about Gentry, dangling third basemanJim Fregosi as bait. Unwilling to part with Gentry, the Mets sent Nolan Ryan to the Angels in one of the most infamous trades in franchise history. He would remain with the Mets for one more seasons, going 7-10 with a 4.01 ERA. Following the season, he & relief pitcherDanny Frisella were traded to the Atlanta Braves for All-Star second baseman Félix Millán & left hander George Stone.
Atlanta Braves
Gentry exited his June 5 start in the first inning due to right elbow soreness. He made his next start, but was pulled after the second inning, and placed on the disabled list. He returned a month later, but after just two more appearances, his season was ended for good. After surgery to have bone chips removed from his elbow, Gentry returned to the mound on April 30,, pitching an inning of relief. He made two more appearances before his season was once again cut short, this time for tendon surgery. He made seven appearances in before the Braves decided to end their relationship with Gentry. He played his last game for the Braves on May 6, and was waived two days later. Shortly afterwards, Gentry was re-signed by the Mets, but after just one appearance at Double-A Jackson was released on June 19.
Career stats
W
L
PCT
ERA
G
GS
CG
SHO
SV
IP
BF
H
ER
R
HR
BAA
K
BB
BB/9
WP
HBP
Fld%
Avg.
SH
46
49
.484
3.56
157
138
25
8
2
902.2
3800
770
357
400
90
.231
615
369
3.7
29
28
.995
.095
25
Gentry was an exceptional fielding pitcher. The only error he committed in his career came on August 23, 1970, covering first on a ground ball by Pete Rose.