Leeds Rhinos
Senior signed for the Rhinos on the final day of the 1999 Super League regular season. He made his debut for the club on the same day, against the London Broncos. After a quiet start to his Rhinos career, Senior burst into life in 2000 finishing the season as joint top try scorer with 18, including four in a single match against the then Halifax Blue Sox.
Senior represented England at the 2000 Rugby League World Cup.
Senior also represented Yorkshire in the now defunct 'War of the Roses' Origin Series, against cross-Pennine rivals Lancashire. Senior played in three consecutive defeats in 2001 and 2002, twice at Headingley, scoring two tries. In 2003 Yorkshire beat Lancashire. Senior scored two tries in the 56-6 victory at Odsal Stadium.
In 2003 Senior was named the Leeds Rhinos Players' Player of the Year.
In 2004 Senior made 30 appearances and scored 13 tries as the Rhinos ended their 32-year wait for the Championship, beating the Bradford Bulls 16-8 in the Grand Final.
By this time Senior held the record of playing the most Super League rounds of any player, with 223 out of a possible 237. In 2005 Senior became only the 20th player in the club's history to score 100 tries in his career.
In January 2007 Senior celebrated his Testimonial match for the Rhinos with a 50-0 thrashing of his home town club, the Huddersfield Giants. Senior scored a late try in the match.
Also in 2007 Senior played in all three Test matches during the 3-0 series whitewash over New Zealand. The third and final Test of the series was the last time Great Britain would play as a team.
Senior was an integral part of the Rhinos squad that won the Super League Grand Final for three consecutive seasons in 2007, 2008 and 2009, all against St Helens.
Senior traveled to Australia to represent England in the 2008 World Cup.
During the 2009 season, Senior became the first player to reach 500 Super League appearances. He also announced his retirement from representative rugby in 2009.
At the end of the 2010 season Senior was named in the Super League Dream Team for the fifth time in his career.
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