sportsmen

/sportsmen/

Cases

SingularPluralWhen to use it
nominativesportsmenthe athletesportsmenlethe athletesthe plain dictionary form — the doer of the sentence
genitivesportsmennithe athlete'ssportsmenlenithe athletes'the owner — whose it is
accusativesportsmennithe athlete (as the object)sportsmenlenithe athletes (as the object)a specific, known object — whom or what
dativesportsmengeto the athletesportsmenlegeto the athletesdirection or recipient — to where, to whom
locativesportsmendeat / in the athletesportsmenledeat / in the athleteswhere it is; also having — mende bar, "I have it"
ablativesportsmendenfrom the athletesportsmenledenfrom the athleteswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mysportsmenimmy athletesportsmenlerimmy athletes
yoursportsmeningyour athletesportsmenleringyour athletes
his / hersportsmenihis / her athletesportsmenlerihis / her athletes
oursportsmenibizour athletesportsmenleribizour athletes
you all'ssportsmenigizyou all's athletesportsmenlerigizyou all's athletes
theirsportsmenleritheir athletesportsmenleritheir athletes

The overlap in the last rows is real, not a mistake: sportsmenleri can mean "his / her athletes", "their athlete", or "their athletes" — context decides.