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GMTC Tennis Club is a growing grassroots tennis community based in Balikpapan, East Kalimantan, Indonesia. Founded in 2025, GMTC brings together tennis players, professionals, business owners and community members through regular tennis drills, match play, private sessions, tournaments and social activities. GMTC focuses on building an active and connected tennis community, combining sport, lifestyle, networking and meaningful relationships beyond the court. Our community welcomes players across different experience levels, from beginners to more competitive players. We organize regular community sessions and internal competitions, while creating opportunities for brands to engage directly with an active and affluent local audience through event activation, product placement, branded content, community engagement and digital exposure. Our current community footprint includes 98 registered members, 45 active members and more than 900 player attendances across our tennis activities. GMTC is based in Balikpapan with ambitions to expand its community network across East Kalimantan and beyond.
New to athlete partnerships? See how sports sponsorship works on OpenSponsorship.
Brands can sponsor GMTC on OpenSponsorship by creating a free account, browsing GMTC'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 team.
GMTC 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 team.
According to OpenSponsorship, GMTC's audience includes 1K+ Instagram followers, based in Balikpapan, East Kalimantan, Indonesia. 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