Here’s a clear breakdown of sales comparisons between EA’s UFC games and EA’s classic boxing titles (Knockout Kings + Fight Night):

📊 Sales Breakdown: UFC vs. Boxing Games

1. Knockout Kings Era (1998–2003)

EA released 5 Knockout Kings games across PS1, PS2, and N64.
Sales were moderate but never massive.
Average units sold per title: ~500K–1M worldwide.
Knockout Kings was considered successful enough for its time, but never reached the numbers of FIFA, Madden, or even NBA Live.

Fight Night 2004: Breakout hit, ~1.5M copies sold.
Fight Night Round 2 (2005): ~1.8M–2M.
Fight Night Round 3 (2006): Best-selling boxing game ever → ~2.5–3M copies (helped by Xbox 360 launch).
Fight Night Round 4 (2009): ~2.5M copies.
Fight Night Champion (2011): ~2M copies lifetime.

🔑 Total Fight Night franchise sales = ~11M+ across 5 games.
This is the peak of boxing games commercially.

EA Sports UFC (2014): ~1.5M copies.
EA Sports UFC 2 (2016): ~2M copies.
EA Sports UFC 3 (2018): ~2.5M copies.
EA Sports UFC 4 (2020): ~3M copies lifetime.
EA announced UFC 4 had the highest engagement and sales of the series, with UFC 5 (2023) expected to surpass it.

🔑 Total EA UFC franchise sales = ~9–10M+ across 4 games.

Franchise	Titles	Lifetime Sales (approx.)	Peak Title Sales
Knockout Kings	5	~3–4M total	~1M (best entry)
Fight Night	5	~11M+ total	~2.5–3M (Round 3 & 4)
EA UFC	4	~9–10M+ total	~3M (UFC 4)

Fight Night > UFC (overall franchise sales). Fight Night still holds the crown for the most successful boxing series.
UFC > Knockout Kings (both in single-title and total sales). UFC titles consistently outsold KK.
UFC 4 is the single best-selling MMA game ever, and Fight Night Round 3 is the single best-selling boxing game ever.

📈 Fight Night Round 3 (2006) peaked at nearly 3M copies sold.
📈 UFC 4 (2020) is the strongest MMA title, at around 3M.
🥊 Fight Night franchise overall still sold more across fewer titles compared to UFC.
🎮 Knockout Kings stayed below the 1M mark per entry, showing why EA shifted to Fight Night.