'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 2004 Super League 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. Senior was selected in the Great Britain team to compete in the end of season 2004 Rugby League Tri-Nations tournament. In the final against Australia he played at centre in the Lions' 44–4 loss. On 23 December 2004 the Rugby Football League fined Senior along with Leeds' teammate Ryan Bailey £1,500 each after they tested positive to the banned stimulant ephedrine. As Super League IX champions, the Rhinos faced 2004 NRL season premiers, the Canterbury-Bankstown Bulldogs in the 2005 World Club Challenge. Senior played at centre in Leeds' 39–32 victory. In 2005 Senior became only the 20th player in the club's history to score 100 tries in his career. Senior played for the Rhinos in the 2005 Challenge Cup Final at centre in their loss against Hull FC. 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 was selected for the England squad to compete in the 2008 Rugby League World Cup tournament in Australia. Group A's first match against Papua New Guinea he played at centre in England's victory. During the 2009 season, Senior became the first player to reach 500 Super League appearances. In 2009 Arriva Yorkshire asked local members of the public to nominate the thirteen best