SJ Berwin is set to pursue its long-mooted US merger with Proskauer Rose in a deal that would create a global top 30 law firm with combined revenues of over £600m.

As legalweek.com revealed on 6 May, Proskauer Rose had been identified as the sole potential US suitor after Orrick Herrington & Sutcliffe, another firm that SJ Berwin had considered a deal with, last week ruled itself out.