Sign Up for Our. Christian Pulisic Signed USA Nike Strike Soccer Ball. A USA Nike Strike Soccer Ball hand signed by Christian Pulisic. The item and signature are in excellent condition. Christian is a professional soccer player for Chelsea FC and United States National Team. AUTHENTICATION: The item is accompanied by a Panini Authentic Certificate of Authenticity – Panini Authentic Serial Numbered and Databased Hologram Radtke Sports uses professional lighting for our product images that may show reflections. Items that are damaged or if an item is not the item ordered this does not apply. Welcome to Radtke Sports where we offer thousands of autographed sports memorabilia. At Radtke Sports we also tell you when and where the item was signed. How many sports memorabilia companies do that? Browse our large selection of football, baseball, basketball, and soccer items. Everything we sell is hand signed by the athletes and comes with a Radtke Sports Certificate of Authenticity, or COA, and a picture of the athlete signing the product when available. Radtke Sports, Inc was established in 1999 to serve sports memorabilia collectors with authentic hand signed memorabilia. Radtke Sports has become one of the leading autographed memorabilia companies in the industry. We also have developed a Sports Marketing program that rivals many of the largest Sports Firms in the United States. We have developed relationships and supply some of the leading autographed sports memorabilia companies such as: Steiner Sports, Tri-star, and Mounted Memories We are Brett Favre’s largest autograph distributor in the United States. We hold many private signings each year with athletes such as Brett Favre, Joe Namath, Joe Montana, Jerry Rice, Jason Heyward, Chipper Jones, Mike Schmidt, John Elway, and many more. Items we do not acquire in person come from the athlete’s authorized agents such as Mounted Memories (Dan Marino), Tri-Star (Bart Starr and Bo Jackson), and Steiner Sports (Derek Jeter) just to name a few.