I assume they are playing in the Tokyo Dome, if not disregard.
<TABLE class="infobox vcard" style="FONT-SIZE: 90%; WIDTH: 21em; TEXT-ALIGN: left"><TBODY><TR><TD style="TEXT-ALIGN: center" colSpan=2>
</TD></TR><TR><TH>Location</TH><TD>3, Koraku 1-chome,
Bunkyo-ku,
Tokyo,
Japan</TD></TR><TR><TH>
Coordinates</TH><TD>
35°42′20.37″N, 139°45′6.89″E</TD></TR><TR><TH>Opened</TH><TD>
March 17,
1988</TD></TR><TR><TH>Owner</TH><TD>Tokyo Dome Corporation</TD></TR><TR><TH>Tenants</TH><TD>
Yomiuri Giants (
NPB(
Central League)) (
1988-present)
Nippon Ham Fighters(
NPB(
Pacific League)) (
1988-
2004)
</TD></TR><TR><TH>Capacity</TH><TD>Officially "55,000" but actaully 42,000 + standing room of about 3,000</TD></TR><TR><TH>Field dimensions</TH><TD>Facility Capacity Area<SUP class=reference id=cite_ref-0>
[1]</SUP> Site: 112,456 sq m (1.21 x 106 sq ft)
Building: 46,755 sq m (503,267 sq ft)
Field: 13,000 sq m (139,931 sq ft)
Right, Left: 100 m (328.1 ft)
Center: 122 m (400.3 ft)
Capacity: 1,240,000 cubic m (4.378x107 cubic ft)
</TD></TR></TBODY></TABLE>