[7] This early Cape League operated through the 1939 season and disbanded in 1940, due in large part to the difficulty of securing ongoing funding during the Great Depression.

[13][14][15][16] In all three seasons from 1927 to 1929, the team featured Boston College batterymates pitcher Pete Herman and catcher George Colbert, as well as flashy infielder Artie Gore.

The team starred all-league selection Frank Skaff of Villanova, an outfielder who "covers acres of territory, catches everything in sight," and was "the dread of all opposing pitchers", and who went on to play for the Brooklyn Dodgers two years later.

Blanche, a Somerville, Massachusetts native who went on to play with the major league Boston Braves, outdueled Falmouth's Harold Poole, 3–1, to complete the three-game sweep and secure the title for Harwich.

[23][24][25] In 1937 and 1938, Harwich was led by player-manager Neil Mahoney, an all-Cape League selection at catcher who went on to be scouting director of the Boston Red Sox.

[26][27][28] Mahoney's 1937 Harwich team featured Holy Cross pitcher Art Kenney and former Chicago White Sox outfielder Bill Barrett.

Harwich's native son and Boston College hurler Peter Ford spent four summers with the team, posting a combined ERA of 3.36 with 18 wins and two league all-star selections.

[51] In 1968, CCBL Hall of Fame manager John Carroll took the reins and led the Mariners to a 26–13 record, winning the Lower Cape Division in the team's final season at Brooks Park.

[65] The Mariners finished the regular season in third place, but eliminated Hyannis two games to one in the playoff semi-finals to earn a berth in the best-of-five title series against top-seeded Cotuit.

[66] In Game 1 of the 1983 championship series, the Mariners came out on the wrong end of a 1–0 pitchers' duel, won on an RBI single by Kettleer Will Clark.

Harwich starter Mike Ulian was hit hard for seven runs, and Souza, who had pitched a complete game the day before, came on and was effective in long relief.

[67][68][69] The 1984 Mariners finished the regular season atop the league with an impressive 27–15 record, due in large part to the contributions of four CCBL Hall of Famers.

League Outstanding Pro Prospect Award winner Mike Loggins batted .343 with 13 homers and was MVP of the CCBL All-Star Game at Philadelphia's Veterans Stadium.

The team also featured future major leaguers John Flaherty, University of Massachusetts infielder Gary Disarcina, and slugger Bob Hamelin, who led the league with 11 home runs.

Led by manager Bill Springman, the Mariners finished the regular season with the league's best record, and met Cotuit in the playoff semi-finals.

In Game 1, Harwich struck early at home with a three-run bomb by Steve Finken in a four-run first inning, and Kite went the distance on the hill, striking out 13 Kettleers en route to a 4–2 win.

Finken hit a two-run dinger in Game 2 at Lowell Park, and teammate Tom Boyce added a pair of homers, but it wasn't enough as Cotuit prevailed, 9–8 in 10 innings.

Boyce hit yet another clout in the seventh to narrow the margin, and Derek Lee proved the hero with a three-run go-ahead blast in the eighth.

[75][76] Holbrook's squad dropped the 1997 finals series to Wareham,[77][78] a team that starred a familiar face: league MVP and CCBL Hall of Famer Carlos Peña, who had played for Harwich the previous season.

The Mariners also boasted the league's Outstanding Pitcher Award winner for three consecutive seasons with Eddie Yarnall (1995), Billy Coleman (1996) and Brent Hoard (1997).

The Commissioner had been a longtime summer resident of Harwich and a fan of the Mariners and the CCBL, and wished to honor his late father who had been the baseball captain at Yale University in 1931.

[52] The 2004 Mariners featured CCBL Hall of Famer Craig Hansen, a hard-throwing closer who recorded a perfect 0.00 ERA with 41 strikeouts in 22.1 innings of work.

Harwich pushed across the go-ahead run in the top of the 20th, and second baseman Tug Hulett took the mound and recorded the save for the Mariners in the 5 hour, 52 minute affair.

The club featured future major league all-stars Brandon Belt and DJ LeMahieu, as well as one of the CCBL's top hitters, Tommy Medica, who batted .352 for the season.

A leadoff triple by Joe Sanders revived the Mariners' hopes, and with the bases loaded on a walk and hit batsman, skipper Steve Englert brought in pinch-hitter Mark Fleury.

No stranger to late-inning heroics, Fleury had secured the East Division's 8–6 win in the CCBL All-Star Game with a two-run eighth-inning homer earlier in the season.

For his clutch pinch-hit, Fleury was named playoff co-MVP with Jason Stidham, who had driven in seven runs for Harwich in Game 1 of the title series.

[97] The Mariners went down 2–0 early to the Whitecaps in Game 3, but scratched their way back behind 5.1 innings of scoreless relief by Eddie Butler,[98] and Overman came on to get the final two outs to clinch the series with a 3–2 Harwich victory.

Austin Nola homered for the Mariners, and Overman came in with runners on base in the ninth to close the door on the 4–2 Harwich victory to complete the series sweep.

[117][118][119] In 2023, longtime league executive Mary Henderson marked her 40th year as President of the Harwich Athletic Association and was named to the CCBL Hall of Fame.