What was the world champion rugby team in 2018?
2018 Rugby World Cup Sevens
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The 2018 Rugby World Cup Sevens was the seventh edition of the Rugby World Cup Sevens. Organised by World Rugby, it was held at AT&T Park in San Francisco, United States. A total of 84 matches (52 men's and 32 women's) were played over three days from July 20–22, 2018 with both tournaments being played for the first time in a knock-out only format.[1] 
New Zealand won the championship for both events — defeating England in the men's final and France in the women's final.