Imeh got the better of Nonso Madueke, winning the first set 6-3 before Madueke retired due to a groin injury when he was leading the second set 3-1.
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The matches, which were played in Abuja, made the 40th edition of the championships more exciting to spectators as they look forward to the final on Saturday.
Babalola, current number two seed of Nigeria Tennis Federation, said this in an interview with the News Agency of Nigeria on Friday after defeating his semi-final opponent, Uche Oparaoji in two straight sets.
Samuel, who did not show any sign of tiredness as she played with caution with the 2013 runner-up, told the News Agency of Nigeria that it was not her first time of playing against Aiyegusi