US Tennis Center championship runner-up medals, awarded by the USTA (United States Tennis Association) for various junior, adult, and senior national events, are collectible vintage items, featuring specific designs and inscriptions for different years and divisions, with some being ornate silver or gold-filled pieces recognizing prestigious national titles, though not to be confused with Olympic medals or US Open trophy replicas for champions. 
Examples of Specific Medals:
USTA Junior Singles Runner-Up: A 1951 medal for the "Junior Hardcover Singles Championship Runner-Up" was listed.
What They Look Like (General Characteristics):
In essence, searching online marketplaces for vintage USTA or USLTA medals is the best way to find these historic runner-up awards.