Question: Who is number 22 of Serena Williams' sports team?
Answer(s):
answer: Jamar Taylor

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:sports.professional_sports_team.owner_s ns:m.015z4j . 
?c ns:sports.sports_team.roster ?y .
?y ns:sports.sports_team_roster.player ?x .
?y ns:sports.sports_team_roster.number ?sk0 .
FILTER (str(?sk0) = "22")
FILTER(NOT EXISTS {?y ns:sports.sports_team_roster.from ?sk1} || 
EXISTS {?y ns:sports.sports_team_roster.from ?sk2 . 
FILTER(xsd:datetime(?sk2) <= "2015-08-10"^^xsd:dateTime) })
FILTER(NOT EXISTS {?y ns:sports.sports_team_roster.to ?sk3} || 
EXISTS {?y ns:sports.sports_team_roster.to ?sk4 . 
FILTER(xsd:datetime(?sk4) >= "2015-08-10"^^xsd:dateTime) })
}