That 2007 tournament was Rika's last at under-19 level, and he had made his senior debut in the gap between under-19 events, appearing for Fiji in the 2006 EAP Trophy and the 2007 World Cricket League Division Three tournament. His EAP Trophy had included an innings of 50 not out in the opening match against Japan, made from 49 balls. At the 2008 WCL Division Four tournament in Tanzania, Rika was the only Fijian batsman to record more than 100 runs overall, finishing with 194 runs and a batting average of 32.33. His best innings, 62, came in the 5th-place playoff against Jersey, which his team won. However, both teams were relegated to the 2010 Division Five tournament in Nepal. Rika, aged 22 at the time, was appointed Fiji's captain in the place of the injured Joe Sorovakatini, and again made his highest score against Jersey, although his innings of 75 from 134 balls was not enough to prevent his side losing. Fiji and Jersey were eventually both relegated again, to the 2011 Division Six event in Malaysia. Again named captain, Rika led Fiji's batting with 185 runs from six innings, and twice scored half-centuries – 55 against Kuwait and 52 against Jersey.