Marcel Siem is a German professional golfer who plays on the European Tour.
New to athlete partnerships? See how sports sponsorship works on OpenSponsorship.
1 post & 1 story with the Marcel Siem promoting your product.
Long-term deal involving appearances, photoshoots, social media and more.
Have Marcel Siem make a live appearance at your next event
Brands can sponsor Marcel Siem on OpenSponsorship by creating a free account, browsing Marcel Siem's profile, and sending a sponsorship proposal for social posts, appearances, or integrated campaigns. OpenSponsorship handles messaging, deliverables, and deal terms in one platform so you can connect directly with this athlete.
Marcel Siem is listed on OpenSponsorship and available for brand sponsorships. Brands can review campaign packages, audience details, and pricing on this profile, then submit a proposal to start a partnership with this athlete.
According to OpenSponsorship, estimated pricing to sponsor Marcel Siem starts at $400 for a social media post, $600 for a appearance and $3,600 for a brand ambassador campaign. Final rates depend on deliverables, usage rights, and campaign scope. Sign up on OpenSponsorship to view packages and send a proposal.
According to OpenSponsorship, Marcel Siem's audience includes interests including Food & Drink, Alcohol, based in Ratingen, North Rhine-Westphalia, Germany. Brands can use this profile to evaluate reach, content niche, and sponsorship fit before sending a proposal.
How do you measure influencer marketing ROI when half the numbers social media gives you are vanity metrics? It is the question brands ask us most, and it came up again when I joined Massimo Marinelli on the Berkida Ventures Podcast. After more than ten years and thousands of brand deals with athletes and creators at OpenSponsorship, here is how we think about it, and the framework we use with our clients.
October 28, 2026
