Respected user, hi I evaluated your query thoroughly.
*Lack of urination is directly related to decreased urine formation due to
 - excess perspiration lossing body fluids to major extent.
 - inadequate liquid intake during the same time.
 - 
adrenaline drive during the match causing 
hormonal effects.
 - exposure to excess heat of atmosphere.
 - 
stress of the event.
 @give plenty of liquids - coconut water, lemon juice, green tea, coffee, 
    butter milk, rice water , juices.
  @maintain his BP , Blood sugar , temperature  levels.
  @
Cold sponging over head.
  @Avoid exposure to heat.
  @Consult family doctor if necessary after 2-3 hours .
 Hope this clears your query.
 Thanks for using Health Care Magic & reviewing my answer.
 Wishing your athlete a fast and speedy recovery from the same.
 Bye dear take care.
 Regards.