Niners
The Niners were an amateur baseball team, formed in 2375 by Starfleet Captain Benjamin Sisko and consisting of crew members of starbase Deep Space 9 as well as several of its civilian residents.

Assembled to meet a challenge issued by Captain  and his team, the Vulcan Logicians of the starship , the Niners participated in one baseball game in one of DS9's holosuites. With only team members Benjamin Sisko, his son Jake Sisko and girlfriend Kasidy Yates having any experience with the game, the Niners' experience was one of intense training. Benefiting the team were the gymnastic talents of Ezri Dax, the genetically-engineered physical abilities of Julian Bashir and the natural strength of Klingon player Worf, the team nevertheless lost to the Logicians. Sisko was ejected from the game by umpire Odo, and shortly thereafter, Rom was brought in as a pinch-hitter. The Niners scored a single run from Nog, on an accidental (but triumphant) squeeze bunt by Rom.  When the Niners exuberantly celebrated the run, Logicians manager Solok complained to Odo, accidentally touching him, and got ejected. ()

Quark recalled playing for the Niners later that year. ()

Defensive alignment: 
Pitcher: Jake Sisko (#78)
Pinch hitter: Rom (#13) (9th Inning)
Catcher: Nog (#25)
First baseman: Worf (#32)
Second baseman: Benjamin Sisko (#15) (ejected), Julian Bashir (#22) (after Sisko's ejection)
Third baseman: Kasidy Yates (#47)
Shortstop: Kira Nerys (#9)
Left fielder: Leeta (#55)
Center fielder: Ezri Dax (#43)
Right fielder: Julian Bashir (#22), Quark (#7) (after Sisko's ejection)
Quark (#7)

Line score

Appendices

Apocrypha
In Star Trek Online, the Niners are part of an interstellar baseball league supported by now-Grand Nagus Rom, which also includes the Logicians (now playing for the city of ShiKahr on Vulcan), the Pike City Pioneers, the London Kings, the Caitian Claws, and the Ferenginar Liquidators, among others. The team pennants can be seen all around the Promenade on Deep Space Nine.

External link 
 

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Sports organizations