During his junior year (2010) Phiri won the NCAA silver medal in the 60 meters with a season-best time of 6.60 seconds, and placed fourth in the 100 meters and finished eighth in the 200 meters at the 2010 NCAA Division I Outdoor Track and Field Championships. At the Big 12 Conference meet he secured the gold medal in the 60 metres, the silver medal in the indoor 60 metres, and was the bronze medallist in the indoor 200 metres. That same year Phiri competed as part of a relay team which established a new time record in the 4 x 200 metres in securing the Texas relays title (one minute, 22:31 seconds), and secured five victories as part of a 4 x 100 metres relay squad. He recorded an indoor career best time of 20:87 seconds en route to winning the Texas A&amp;M Conference Challenge in his final collegiate sporting year. Phiri won the 100 metres event at the 2011 Texas Relays, with a new time record of 10:06 seconds. He competed in the 100 metres at the 2011 World Championships in Athletics but did not advance to the semi-finals of the event after finishing sixth in his heat.