Photo by Alicia Alumbaugh | Sullivan senior Lexi Deckard (left) returns a shot in Monday's match against South Knox. Deckard and playing partner Emma Couch suffered their first defeat as a duo in the Arrows' first loss of the season.

BY TRAVIS DAVID [email protected]   The South Knox girls tennis team proved to be worthy of their state ranking on Monday. The Spartans, ranked No. 30 in the latest state poll, handed Sullivan its first loss of the season in a battle of unbeaten teams.   South Knox picked up…